Migrate project metadata from setup.py to pyproject.toml as per PEP 621.

[levi178u]

We can simplify and modernize our packaging by moving static metadata like name, version, description, and dependencies from setup.py to pyproject.toml as defined in PEP 621.

This will:

• Make the project more standardized and tool-friendly.
• Simplify setup.py.
• Allowsetuptoolsto read metadata automatically from pyproject.toml.

Also, console_scripts can be declared using {} instead of dict() for better and faster performance.

References:

• https://peps.python.org/pep-0621/
• https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html