Issue:
Bug: FEATURE] : [Nexinets] mask pii information in connector request and response 



### Feature Description

Mask pii information passed and received in the connector request and response

### Possible Implementation

Refactor all sensitive response and request fields secret

### 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
- [x] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Mask pii information passed and received in the connector request and response for Nexinets.


## Test Case
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
1. Create a mandate payment
```
curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key:{{api_key}}' \
--data-raw '{
    "amount": 6540,
    "currency": "EUR",
    "confirm": true,
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "amount_to_capture": 6540,
    "customer_id": "StripeCustomer",
    "email": "guest@example.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+65",
    "description": "Its my first payment request",
    "authentication_type": "no_three_ds",
    "return_url": "https://duck.com",
    "payment_method": "card",
    "payment_method_data": {
        "card": {
            "card_number": "4111111111111111",
            "card_exp_month": "10",
            "card_exp_year": "25",
            "card_holder_name": "joseph Doe",
            "card_cvc": "123"
        }
    },
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "PiX"
        }
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "PiX"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    },
    "setup_future_usage": "off_session",
    "mandate_data": {
        "customer_acceptance": {
            "acceptance_type": "offline",
            "accepted_at": "1963-05-03T04:07:52.723Z",
            "online": {
                "ip_address": "13.232.74.226",
                "user_agent": "amet irure esse"
            }
        },
        "mandate_type": {
            "multi_use": {
                "amount": 799,
                "currency": "USD"
            }
        }
    }
}'
``` 

1.b. Check if all the sensitive data in the `masked_response` and also in `request` is masked

```
curl --location '{{base_url}}/analytics/v1/connector_event_logs?type=Payment&payment_id={{payment_id}}' \
--header 'sec-ch-ua: "Not A(Brand";v="99", "Google Chrome";v="121", "Chromium";v="121"' \
--header 'sec-ch-ua-mobile: ?0' \
--header 'authorization: Bearer JWT_token' \
--header 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36' \
--header 'Content-Type: application/json' \
--header 'Referer: https://integ.hyperswitch.io/' \
--header 'api-key: {{api-key}}' \
--header 'sec-ch-ua-platform: "macOS"'
```

Response: 
```
masked_response\ : {\\\"orderId\\\":\\\"qyompda9ts\\\",\\\"transactionType\\\":\\\"DEBIT\\\",\\\"transactions\\\":[{\\\"transactionId\\\":\\\"transaction_bsglkkgnm3\\\",\\\"type\\\":\\\"DEBIT\\\",\\\"currency\\\":\\\"EUR\\\",\\\"status\\\":\\\"PENDING\\\"}],\\\"paymentInstrument\\\":{\\\"paymentInstrumentId\\\":\\\"*** alloc::string::String ***\\\"}
```

_Note:MIT is not fully implemented in Nexinets_

## Impact Area
1. CIT Payment create



## 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:

Patch:
diff --git a/crates/router/src/connector/nexinets/transformers.rs b/crates/router/src/connector/nexinets/transformers.rs
index 07488271aea..9fdaaa36b36 100644
--- a/crates/router/src/connector/nexinets/transformers.rs
+++ b/crates/router/src/connector/nexinets/transformers.rs
@@ -3,7 +3,7 @@ use base64::Engine;
 use cards::CardNumber;
 use common_utils::errors::CustomResult;
 use error_stack::{IntoReport, ResultExt};
-use masking::{PeekInterface, Secret};
+use masking::{ExposeInterface, PeekInterface, Secret};
 use serde::{Deserialize, Serialize};
 use url::Url;
 
@@ -86,7 +86,7 @@ pub struct CardDetails {
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct PaymentInstrument {
-    payment_instrument_id: Option<String>,
+    payment_instrument_id: Option<Secret<String>>,
 }
 
 #[derive(Debug, Serialize)]
@@ -357,7 +357,7 @@ impl<F, T>
             .payment_instrument
             .payment_instrument_id
             .map(|id| types::MandateReference {
-                connector_mandate_id: Some(id),
+                connector_mandate_id: Some(id.expose()),
                 payment_method_id: None,
             });
         Ok(Self {
@@ -641,7 +641,7 @@ fn get_card_data(
         true => {
             let card_data = match item.request.off_session {
                 Some(true) => CardDataDetails::PaymentInstrument(Box::new(PaymentInstrument {
-                    payment_instrument_id: item.request.connector_mandate_id(),
+                    payment_instrument_id: item.request.connector_mandate_id().map(Secret::new),
                 })),
                 _ => CardDataDetails::CardDetails(Box::new(get_card_details(card)?)),
             };