refactor(payment_methods): add requires_cvv field to customer payment method list api object

[Chethan-rao]

Type of Change

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

Description

Added new field in the customer list payment method object to include requires_cvv field which specifies whether for a given merchant, cvv is a required_field to be collected. If an entry is found in config table, then requires_cvv is set to false i.e., by default cvv is made a required_field for all merchants

Requires db insertion into configs table with key as <merchant_id>_requires_cvv and config as false
DB query - insert into configs(key,config) values('<merchant_id>_requires_cvv',false);

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?

ListPaymentMethodForCustomer object

Checklist

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