Add advanced bank identifier validation and retrieval methods

[neelesh-patil-4417]

Description

This feature adds advanced capabilities to handle bank identifiers, such as enhanced validation for existing identifier types and support for custom identifier formats like SWIFT, Routing Numbers, and IFSC codes. It introduces utility functions to retrieve bank details efficiently and improves error messaging for invalid cases.

Proposed solution

The system will ensure precise validation of input identifiers before processing. The changes modularize validation and retrieval logic into reusable functions. For example, introducing utility methods like IsValidBankIdentifier, GetBankNameFromShortCode, GetDefaultBankIdentifiersFromShortCode, will make the codebase more organized and extensible.

Envison - A consumer of the updated library calls IsValidBankIdentifier("MY", "SWIFT", "PHBMMYKLXXX"), and the function returns true if valid, or a descriptive error if not.
Another use case: GetBankNameFromIdentifier("US", "021000021") retrieves the bank name for the routing number directly, streamlining front-end data presentation in payment forms.

Source of data - https://bank.codes/ (which is widely used for international transfers)

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Latest commit: 0585bfe

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[varunkumark1997]

lets add UT's as well

[varunkumark1997]

lgtm