Migrate to pyproject.toml for Modern Packaging

[javiermas]

Summary

This PR modernizes the project's packaging and dependency management by:

• Migrating from requirements.txt and setup.py to pyproject.toml.
• Ensuring compliance with PEP 518 and PEP 621.
• Simplifying the configuration and build process for developers and contributors.

Changes Made

• Added a pyproject.toml file with:
  • Project metadata (name, version, description, authors, etc.).
  • Dependencies and optional dependencies.
  • Build-system requirements (setuptools or an alternative like poetry/flit).
• Added a poetry.lock file with specific versions for dependencies and subdependencies.
• Removed setup.py and requirements.txt.
• Upgraded tensorflow from 2.5 to 2.18.
• Set minimum python python version to 3.9

Why This Change?

• Modernization: pyproject.toml is the Python community standard for packaging and is supported by most tools.
• Consolidation: Combines metadata and dependencies in a single, easy-to-read file.
• Flexibility: Enables usage of modern build systems without requiring legacy files.