Issue:
Bug: [REFACTOR] add `requires_cvv` config while creating merchant account



### Feature Description

Insert requires_cvv config during merchant account creation itself. while getting that config during list_customer_payment_method, if not found in db, we insert it into db.

### Possible Implementation

in order to reduce db call in during listing payment methods, we insert config for requires_cvv during merchant creation itself

### Have you spent some time checking if this feature request has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This PR includes changes for inserting requires_cvv config during merchant account creation itself. while getting that config during `list_customer_payment_method`, if not found in db, we insert it into db.

### 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
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Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
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## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
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![image](https://github.com/juspay/hyperswitch/assets/70657455/5daec1a0-4a85-4896-b183-86fb585e0a0d)


## 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:

![image](https://github.com/juspay/hyperswitch/assets/70657455/5daec1a0-4a85-4896-b183-86fb585e0a0d)

Patch:
diff --git a/crates/router/src/core/admin.rs b/crates/router/src/core/admin.rs
index dabe22da626..c7009bf4cc9 100644
--- a/crates/router/src/core/admin.rs
+++ b/crates/router/src/core/admin.rs
@@ -219,6 +219,17 @@ pub async fn create_merchant_account(
         .insert_merchant(merchant_account, &key_store)
         .await
         .to_duplicate_response(errors::ApiErrorResponse::DuplicateMerchantAccount)?;
+
+    db.insert_config(diesel_models::configs::ConfigNew {
+        key: format!("{}_requires_cvv", merchant_account.merchant_id),
+        config: "true".to_string(),
+    })
+    .await
+    .map_err(|err| {
+        crate::logger::error!("Error while setting requires_cvv config: {err:?}");
+    })
+    .ok();
+
     Ok(service_api::ApplicationResponse::Json(
         merchant_account
             .try_into()
diff --git a/crates/router/src/core/payment_methods/cards.rs b/crates/router/src/core/payment_methods/cards.rs
index c22b7323095..20a3e130eb2 100644
--- a/crates/router/src/core/payment_methods/cards.rs
+++ b/crates/router/src/core/payment_methods/cards.rs
@@ -1831,7 +1831,7 @@ pub async fn list_customer_payment_method(
         )
         .await
         .change_context(errors::ApiErrorResponse::InternalServerError)
-        .attach_printable("Failed to fetch merchant_id config for requires_cvv")?;
+        .attach_printable("Failed to fetch requires_cvv config")?;
 
     let requires_cvv = is_requires_cvv.config != "false";