Replace setup.pys with pyproject.tomls

[AdeelH]

Overview

This PR replaces all setup.py files with pyproject.toml files.

It also

• Adds a compile_requirements script that compiles the requirements across all the sub-packages into one requirements.txt.
• Adds a setup_dev_env script that installs dependencies from requirements.txt and installs the RV sub-packages in editable mode.
• Makes misc. other fixes to get all of the above to work well.

Notes

N/A

Testing Instructions

Check that CI builds succeed.