Update controller.py

[Ramdas-Chaugale]

Improved Documentation: More comprehensive docstrings and comments for better clarity and understanding. Separation of Concerns: Better separation between validation, initialization, and execution logic to make the code cleaner and more maintainable. Error Handling Improvements: Introduced more explicit error handling and logging for invalid configuration scenarios. Refactored Plugin Initialization: Made plugin initialization more modular by separating it into distinct steps for different plugin types. Loop Signal Handling Improvements: Improved signal handling in the event loop to ensure proper termination of tasks in an asynchronous context. Optimized Inventory Sync: Added checks to ensure proper handling of empty inventory cases, preventing potential crashes. Type Hints & Validations: Added clearer type hints and validations for configuration arguments to prevent runtime errors.