Update registry.py

[YadlaMani]

Key Improvements:
Generic register and get methods: Instead of repeating the same methods for different categories (register_prompt, get_prompt), I've combined them into one generic method with parameters, making the code DRY (Don't Repeat Yourself).
Error Handling in Module Imports: I added a try-except block to catch and log potential import errors for better debugging.
Simplified Module Import Logic: Using Path and relative_to for module resolution simplifies path handling and improves clarity.
Redundant Files Filtering: The code skips unnecessary files (init.py, base.py, etc.) in a more readable manner.
Improved readability: Clearer function and variable names with comments describing their purpose.