refactor(connnector): Structure connector enums in separate files for improved team ownership

[srujanchikke]

Type of Change

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

Description

Refactoring connector enums to separate files to give code ownership to connector team for connector related changes.

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?

Cypress tests should be suffice

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

[semanticdiff-com]

Review changes with  

Changed Files

File	Status
.github/CODEOWNERS	Unsupported file format
crates/api_models/src/connector_enums.rs	0% smaller
crates/api_models/src/enums.rs	0% smaller
crates/api_models/src/lib.rs	0% smaller
crates/common_enums/src/connector_enums.rs	0% smaller
crates/common_enums/src/enums.rs	0% smaller
crates/common_enums/src/lib.rs	0% smaller
crates/router/src/configs/defaults.rs	Unsupported file format
crates/router/src/configs/defaults/payment_connector_required_fields.rs	0% smaller
scripts/add_connector.sh	Unsupported file format