Issue:
Bug: [FEATURE]: [Airwallex] Use `connector_request_reference_id` as reference to the connector



### :memo: Feature Description 

- We transmit our reference id from Hyperswitch to the connector, enabling merchants to subsequently locate the payment within the connector dashboard.
- Presently, there is a lack of uniformity in this process, as some implementations employ `payment_id` while others utilize `attempt_id`.
- This inconsistency arises from the fact that `payment_id` and `attempt_id` correspond to two distinct entities within our system.

### :hammer: Possible Implementation 

- To mitigate this confusion, we've introduced a new field called `connector_request_reference_id` in our RouterData. 
- This id should replace them as a reference id to the connector for payment request. 
- One might need to have exposure to api docs of the connector for which it is being implemented.
- You can check this PR for further reference https://github.com/juspay/hyperswitch/pull/2052

: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 -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
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### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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2. `crates/router/src/configs`
3. `loadtest/config`
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## Motivation and Context
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## How did you test it?
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## Checklist
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- [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/airwallex/transformers.rs b/crates/router/src/connector/airwallex/transformers.rs
index ecdddfb3672..fc90743ab08 100644
--- a/crates/router/src/connector/airwallex/transformers.rs
+++ b/crates/router/src/connector/airwallex/transformers.rs
@@ -48,7 +48,7 @@ impl TryFrom<&types::PaymentsInitRouterData> for AirwallexIntentRequest {
             request_id: Uuid::new_v4().to_string(),
             amount: utils::to_currency_base_unit(item.request.amount, item.request.currency)?,
             currency: item.request.currency,
-            merchant_order_id: item.payment_id.clone(),
+            merchant_order_id: item.connector_request_reference_id.clone(),
         })
     }
 }