Robust parallelization with Ray

[aalexmmaldonado]

This PR introduces significant enhancements and optimizations to the package by replacing custom multiprocessing with Ray for parallelization. Key changes include:

• Ray Parallelization: Replaced custom multiprocessing with Ray, enabling efficient task scheduling and execution.
• Periodic Saving: Implemented periodic saving during processing to ensure progress is preserved, even in case of interruptions.
• Performance Optimizations: Improved overall performance by optimizing core functions and reducing bottlenecks.
• Modular Refactoring: Refactored the codebase to make components more modular, improving maintainability and extensibility.

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