Improve query parameter normalization and boolean parsing utilities

[Shashank23123458867504]

Summary

This PR refactors the query utility functions to improve readability, maintainability, and robustness while preserving the existing behaviour.

Changes

• Removed redundant import alias for deepcopy
• Added type hints for better code clarity and IDE support
• Replaced type(...) == list with isinstance(...)
• Iterated over dictionary items using .items() to avoid repeated lookups
• Improved variable naming for better readability
• Used endswith("[]") for safer query parameter normalization
• Added docstrings for utility functions
• Replaced logger.error() with logger.exception() to capture complete stack traces
• Improved str2bool() by trimming whitespace and supporting additional truthy values

Testing

• Verified existing query normalization behavior remains unchanged.
• Tested list and scalar query parameters.
• Tested comma-separated query values.
• Tested boolean parsing with various string representations.

Impact

This change is a non-functional refactor that improves code quality, readability, and debugging without modifying the existing functionality.