Modify setup.py for pyproject.toml

[gcanasherrera]

Currently, the project uses setup.py for packaging and dependency management. To modernize the build system and improve compatibility with PEP 517/518 tools, we should migrate to pyproject.toml.

• Create pyproject.toml with the required [build-system] section.
• Move dependencies from setup.py to pyproject.toml (e.g., using setuptools or poetry).
• Update project metadata (name, version, description, author, license, etc.) in pyproject.toml.
• Ensure backward compatibility for setup.py if needed or remove it entirely.
• Test that pip install . and pip wheel . work as expected.
• Update documentation to reflect the new build process.