fix(core): return surcharge in payment method list response if passed in create request

[hrithikesh026]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

If merchant sends surcharge details in payment create call(to override surcharge calculation), we wouldn't send any surcharge details in list payment method call since surcharge won't be generated in this case.

In this PR, I have made some refactors to return surcharge_details against each payment method type in list payment method call even if merchant chooses to override surcharge calculation by sending surcharge details in payments create call.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

Manual
Payment Create with surcharge

Payment method list

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible
• I added a CHANGELOG entry if applicable

[deepanshu-iiitu]

Reviewed only the connector changes on behalf of hyperswitch-connector