Issue:
Bug: [REFACTOR] : [Shift4] Error Message For Connector Implementation



### :memo: Feature Description

- In terms of errors, we are currently throwing a 'not supported' message, which shouldn't be the case as we are yet to decide on the implementation.


### :hammer: Possible Implementation

- In order to manage payment methods that are not implemented by Hyperswitch or yet to be implemented, the connector transformers file should make use of the NotImplemented ConnectorError enum variant.
- By doing so, we will throw same error message for all the Connector Implementation 
- You can check this PR for further reference https://github.com/juspay/hyperswitch/pull/2831


:bookmark: Note: All the changes needed should be contained within `hyperswitch/crates/router/src/connector/`


### :package: Have you spent some time checking if this feature request has been raised before?

- [X] I checked and didn't find a similar issue

### :package: Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### :sparkles: Are you willing to submit a PR?


Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->


### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
Resolves #2860 


## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
No test cases required. As In this PR only error message have been changed from Not Supported error message to NotImplemented error message.

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Testing:

No test cases required. As In this PR only error message have been changed from Not Supported error message to NotImplemented error message.

Patch:
diff --git a/crates/router/src/connector/shift4/transformers.rs b/crates/router/src/connector/shift4/transformers.rs
index 606da2129fb..ce68aad25c5 100644
--- a/crates/router/src/connector/shift4/transformers.rs
+++ b/crates/router/src/connector/shift4/transformers.rs
@@ -168,10 +168,9 @@ impl<T> TryFrom<&types::RouterData<T, types::PaymentsAuthorizeData, types::Payme
             | payments::PaymentMethodData::Reward
             | payments::PaymentMethodData::Upi(_)
             | payments::PaymentMethodData::CardToken(_) => {
-                Err(errors::ConnectorError::NotSupported {
-                    message: utils::SELECTED_PAYMENT_METHOD.to_string(),
-                    connector: "Shift4",
-                }
+                Err(errors::ConnectorError::NotImplemented(
+                    utils::get_unimplemented_payment_method_error_message("Shift4"),
+                )
                 .into())
             }
         }
@@ -184,13 +183,8 @@ impl TryFrom<&api_models::payments::WalletData> for Shift4PaymentMethod {
         match wallet_data {
             payments::WalletData::AliPayRedirect(_)
             | payments::WalletData::ApplePay(_)
-            | payments::WalletData::WeChatPayRedirect(_) => {
-                Err(errors::ConnectorError::NotImplemented(
-                    utils::get_unimplemented_payment_method_error_message("Shift4"),
-                )
-                .into())
-            }
-            payments::WalletData::AliPayQr(_)
+            | payments::WalletData::WeChatPayRedirect(_)
+            | payments::WalletData::AliPayQr(_)
             | payments::WalletData::AliPayHkRedirect(_)
             | payments::WalletData::MomoRedirect(_)
             | payments::WalletData::KakaoPayRedirect(_)
@@ -212,10 +206,9 @@ impl TryFrom<&api_models::payments::WalletData> for Shift4PaymentMethod {
             | payments::WalletData::TouchNGoRedirect(_)
             | payments::WalletData::WeChatPayQr(_)
             | payments::WalletData::CashappQr(_)
-            | payments::WalletData::SwishQr(_) => Err(errors::ConnectorError::NotSupported {
-                message: utils::SELECTED_PAYMENT_METHOD.to_string(),
-                connector: "Shift4",
-            }
+            | payments::WalletData::SwishQr(_) => Err(errors::ConnectorError::NotImplemented(
+                utils::get_unimplemented_payment_method_error_message("Shift4"),
+            )
             .into()),
         }
     }
@@ -227,13 +220,8 @@ impl TryFrom<&api_models::payments::BankTransferData> for Shift4PaymentMethod {
         bank_transfer_data: &api_models::payments::BankTransferData,
     ) -> Result<Self, Self::Error> {
         match bank_transfer_data {
-            payments::BankTransferData::MultibancoBankTransfer { .. } => {
-                Err(errors::ConnectorError::NotImplemented(
-                    utils::get_unimplemented_payment_method_error_message("Shift4"),
-                )
-                .into())
-            }
-            payments::BankTransferData::AchBankTransfer { .. }
+            payments::BankTransferData::MultibancoBankTransfer { .. }
+            | payments::BankTransferData::AchBankTransfer { .. }
             | payments::BankTransferData::SepaBankTransfer { .. }
             | payments::BankTransferData::BacsBankTransfer { .. }
             | payments::BankTransferData::PermataBankTransfer { .. }
@@ -244,10 +232,9 @@ impl TryFrom<&api_models::payments::BankTransferData> for Shift4PaymentMethod {
             | payments::BankTransferData::DanamonVaBankTransfer { .. }
             | payments::BankTransferData::MandiriVaBankTransfer { .. }
             | payments::BankTransferData::Pix {}
-            | payments::BankTransferData::Pse {} => Err(errors::ConnectorError::NotSupported {
-                message: utils::SELECTED_PAYMENT_METHOD.to_string(),
-                connector: "Shift4",
-            }
+            | payments::BankTransferData::Pse {} => Err(errors::ConnectorError::NotImplemented(
+                utils::get_unimplemented_payment_method_error_message("Shift4"),
+            )
             .into()),
         }
     }
@@ -257,11 +244,8 @@ impl TryFrom<&api_models::payments::VoucherData> for Shift4PaymentMethod {
     type Error = Error;
     fn try_from(voucher_data: &api_models::payments::VoucherData) -> Result<Self, Self::Error> {
         match voucher_data {
-            payments::VoucherData::Boleto(_) => Err(errors::ConnectorError::NotImplemented(
-                utils::get_unimplemented_payment_method_error_message("Shift4"),
-            )
-            .into()),
-            payments::VoucherData::Efecty
+            payments::VoucherData::Boleto(_)
+            | payments::VoucherData::Efecty
             | payments::VoucherData::PagoEfectivo
             | payments::VoucherData::RedCompra
             | payments::VoucherData::RedPagos
@@ -273,10 +257,9 @@ impl TryFrom<&api_models::payments::VoucherData> for Shift4PaymentMethod {
             | payments::VoucherData::MiniStop(_)
             | payments::VoucherData::FamilyMart(_)
             | payments::VoucherData::Seicomart(_)
-            | payments::VoucherData::PayEasy(_) => Err(errors::ConnectorError::NotSupported {
-                message: utils::SELECTED_PAYMENT_METHOD.to_string(),
-                connector: "Shift4",
-            }
+            | payments::VoucherData::PayEasy(_) => Err(errors::ConnectorError::NotImplemented(
+                utils::get_unimplemented_payment_method_error_message("Shift4"),
+            )
             .into()),
         }
     }
@@ -286,15 +269,12 @@ impl TryFrom<&api_models::payments::GiftCardData> for Shift4PaymentMethod {
     type Error = Error;
     fn try_from(gift_card_data: &api_models::payments::GiftCardData) -> Result<Self, Self::Error> {
         match gift_card_data {
-            payments::GiftCardData::Givex(_) => Err(errors::ConnectorError::NotSupported {
-                message: utils::SELECTED_PAYMENT_METHOD.to_string(),
-                connector: "Shift4",
+            payments::GiftCardData::Givex(_) | payments::GiftCardData::PaySafeCard {} => {
+                Err(errors::ConnectorError::NotImplemented(
+                    utils::get_unimplemented_payment_method_error_message("Shift4"),
+                )
+                .into())
             }
-            .into()),
-            payments::GiftCardData::PaySafeCard {} => Err(errors::ConnectorError::NotImplemented(
-                utils::get_unimplemented_payment_method_error_message("Shift4"),
-            )
-            .into()),
         }
     }
 }
@@ -401,10 +381,9 @@ impl<T> TryFrom<&types::RouterData<T, types::CompleteAuthorizeData, types::Payme
             | Some(payments::PaymentMethodData::Reward)
             | Some(payments::PaymentMethodData::Upi(_))
             | Some(api::PaymentMethodData::CardToken(_))
-            | None => Err(errors::ConnectorError::NotSupported {
-                message: "Flow".to_string(),
-                connector: "Shift4",
-            }
+            | None => Err(errors::ConnectorError::NotImplemented(
+                utils::get_unimplemented_payment_method_error_message("Shift4"),
+            )
             .into()),
         }
     }
@@ -421,13 +400,8 @@ impl TryFrom<&payments::BankRedirectData> for PaymentMethodType {
             payments::BankRedirectData::BancontactCard { .. }
             | payments::BankRedirectData::Blik { .. }
             | payments::BankRedirectData::Trustly { .. }
-            | payments::BankRedirectData::Przelewy24 { .. } => {
-                Err(errors::ConnectorError::NotImplemented(
-                    utils::get_unimplemented_payment_method_error_message("Shift4"),
-                )
-                .into())
-            }
-            payments::BankRedirectData::Bizum {}
+            | payments::BankRedirectData::Przelewy24 { .. }
+            | payments::BankRedirectData::Bizum {}
             | payments::BankRedirectData::Interac { .. }
             | payments::BankRedirectData::OnlineBankingCzechRepublic { .. }
             | payments::BankRedirectData::OnlineBankingFinland { .. }
@@ -436,10 +410,9 @@ impl TryFrom<&payments::BankRedirectData> for PaymentMethodType {
             | payments::BankRedirectData::OpenBankingUk { .. }
             | payments::BankRedirectData::OnlineBankingFpx { .. }
             | payments::BankRedirectData::OnlineBankingThailand { .. } => {
-                Err(errors::ConnectorError::NotSupported {
-                    message: utils::SELECTED_PAYMENT_METHOD.to_string(),
-                    connector: "Shift4",
-                }
+                Err(errors::ConnectorError::NotImplemented(
+                    utils::get_unimplemented_payment_method_error_message("Shift4"),
+                )
                 .into())
             }
         }