Refactored type_utils: added type hints, __all__, and cleaned validat…

[Dhananjay4yu]

This PR refactors the type_utils helper module to improve readability and maintainability:

• Added type hints for better developer support and IDE integration.
• Used collections.abc instead of deprecated collections types.
• Improved error messages and formatting for consistency.
• Introduced __all__ to define explicit public interface.
• Preserved all original function names and behaviors to ensure backward compatibility.

This change improves code quality and makes the module easier to extend and reuse without affecting other parts of the project.