feat(connector): [Adyen] implement Online Banking Thailand for Adyen

[AkshayaFoiger]

Type of Change

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

Description

Online Banking Thailand is a Thailand specific payment method.

"payment_method": "bank_redirect",
  "payment_method_type": "online_banking_thailand",
  "payment_method_data": {
    "bank_redirect": {
      "online_banking_thailand": {
        "issuer": "bangkok_bank"
      }
    }
  }

Additional Changes

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

How did you test it?

Unit Test Case

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

The base branch was changed.