Use pyproject.toml instead of setup.py

[jonyMarino]

Fixes: #

About

This pull request modernizes the Python packaging for the projectairsim client by migrating all package metadata and configuration from the legacy setup.py to a new pyproject.toml file. This aligns the project with current Python packaging standards (PEP 517/518/621), improves maintainability, and streamlines dependency management. The old setup.py is retained only as a minimal compatibility shim.

Migration to modern Python packaging:

• Added a comprehensive pyproject.toml file that defines build system requirements, project metadata, dependencies (including optional extras), and package data configuration, fully replacing the role of setup.py.
• Simplified setup.py to a minimal stub that delegates to setuptools, preserving compatibility with legacy build commands but moving all configuration to pyproject.toml.

How Has This Been Tested?

Screenshots and videos (if appropriate):