Upgrade from `setup.py` to `pyproject.toml`

[jsf9k]

💡 Summary

We should upgrade from our antiquated setup.py file to a more modern pyproject.toml file.

Motivation and context

setup.py is no longer the preferred way to configure a Python project.

Implementation notes

Here are some links that will be helpful in doing this work:

• Python packaging
• Is setup.py deprecated?
• Modernizing a setup.py project
• Python build backends