feat: Implement structured logging and replace prints

[qyzl7]

Summary

This PR introduces a logging to output information to both the console and a file.

As an initial implementation, I have migrated the print() to logger.info() in the following files:

• main.py
• BaseRecommender.py
• GAR.py

Next Steps / To-Do:

• The print() statements in other model files still need to be replaced with the new logging system.
• Other entry point scripts, such as param_search.py, will also require the addition of the logger initialization code to enable logging.

The first work for #13

Changes

• Add logger.py to configure console and file handlers.
• Initialize logger in main.py with dynamic log paths.
• Migrate print statements to logger.info in main.py, BaseRecommender.py and GAR.py.
• Implement a global hook to log unhandled exceptions.