Fix str to bool

[softctwo]

Description

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[softctwo]

This pull request improves the reliability of the str_to_bool function in string_utils.py by making its behavior stricter and more predictable. It also introduces comprehensive unit tests to verify correct handling of valid and invalid inputs.

Function behavior improvements:

• The str_to_bool function now raises a ValueError for any input that does not exactly match accepted boolean strings, rather than returning False for all other cases. This prevents silent failures and makes error handling more explicit.

Testing enhancements:

• Added a new test module test_string_utils.py with unit tests for str_to_bool, covering positive cases, negative cases, and edge cases where invalid input should raise a ValueError. This ensures the function behaves correctly for all expected and unexpected inputs.