Add docstrings and type hinting

The updates include adding docstrings and type hinting to several classes and methods in multiple Python files. This commit also includes fixes for inconsistent code formatting and minor bugs. The docstrings provide essential details about the classes and methods, improving readability and understanding for other developers. Furthermore, the added type hinting will enable better IDE assistance, static analysis, and clarity on expected input and output types. Lastly, the code formatting fixes and bug fixes enhance the overall code quality and maintainability.