V3.0

This MR upgrades mva-trainer to version 3.0.

Major Refactor: Significant restructuring of the codebase for improved maintainability and performance.
New Features:
    Added support for new machine learning models.
    Introduced enhanced data preprocessing pipelines.
    Improved logging and monitoring capabilities.
Bug Fixes:
    Resolved issues related to model training instability.
    Fixed various minor bugs and improved error handling.
Documentation: Updated and expanded documentation to cover new features and changes.

For more details, you can visit the merge request here.