feat: Add South African bank names and bank types to BankNames & BankType enum

[Saptak88]

Type of Change

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

Description

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?

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]

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Changed Files

File	Status
crates/hyperswitch_connectors/src/connectors/gocardless/transformers.rs	71% smaller
crates/hyperswitch_connectors/src/connectors/payload/transformers.rs	67% smaller
crates/hyperswitch_connectors/src/connectors/wellsfargo/transformers.rs	49% smaller
api-reference/v1/openapi_spec_v1.json	6% smaller
api-reference/v2/openapi_spec_v2.json	6% smaller
crates/common_enums/src/enums.rs	0% smaller
crates/hyperswitch_interfaces/src/unified_connector_service/transformers.rs	Unsupported file format
crates/router/src/core/unified_connector_service/transformers.rs	0% smaller

[XyneSpaces]

[should-fix] The new BankNames variants are mapped from common_enums to UCS, but the reverse payments_grpc::BankNames -> common_enums::BankNames conversion was not extended. Please add the same new bank-name variants to the reverse mapping; otherwise UCS responses containing one of these banks will hit the Unknown BankNames variant error during response transformation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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