Add comprehensive type hints to improve code maintainability

[Copilot]

This PR addresses issue #X by adding comprehensive type hints throughout the codebase, replacing the current docstring-based type documentation with modern Python type annotations.

Changes Made

Function Signatures

All public functions now have complete type annotations:

• subprocess_command() - Enhanced with proper Optional and Dict types
• subprocess_commands() - Added List[str] and List[ResponseDict] return types
• multiprocess_functions() - Improved with List[Callable] and nested generic types
• parse_path_file() - Simple str -> List[str] annotation
• log_response() - Added List[ResponseDict] parameter and None return type

Module-Level Variables

Added type annotations for global variables:

logger: logging.Logger = mp.get_logger()
LOGGING_LEVELS: Dict[str, int] = dict(...)

Code Style Improvements

• Fixed PEP 8 compliance issues with spacing around default parameters (param=None → param = None)
• Corrected indentation in multiline dictionary assignments
• Maintained existing ResponseDict TypedDict definition

Benefits

• Better IDE Support: Enhanced autocomplete, refactoring, and error detection
• Static Analysis: Compatible with mypy, pyright, and other type checkers
• Self-Documenting: Type hints make function signatures immediately clear
• Maintainability: Easier to understand parameter and return types without reading docstrings
• Error Prevention: Catches type-related bugs during development

Backward Compatibility

All changes are fully backward compatible. The existing functionality remains unchanged, and all tests continue to pass. The type hints are purely additive and don't affect runtime behavior.

Verification

• ✅ All functions have 100% type annotation coverage
• ✅ Syntax validation passes (AST parsing successful)
• ✅ Custom functionality tests verify type hints work correctly
• ✅ CodeQL security analysis shows no vulnerabilities
• ✅ Existing test suite continues to pass

This modernizes the codebase to follow current Python best practices as outlined in PEP 484 and the official typing documentation.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add type-hints</issue_title>
<issue_description>Could be a nice improvement. Easier to maintain then the current type-hints in doc-string

https://docs.python.org/3/library/typing.html</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #21

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