Migrate to pyproject.toml & hatch

[anselor]

The default recommendation from python seems to be hatch now. It has impressive features including declaring build/test configurations and managing venv environments. In my trial of it on a couple small projects I found it to be much faster than using nox to set up venvs.

The problem is it currently doesn't support a monorepo project with multiple modules or plugin modules. There is a development ticket (https://github.com/pypa/hatch/issues/233) that documents it and it is under active development now. Once that is complete we should be able to migrate to hatch with minimal fuss.

[tleonhardt]

I like the idea of moving to something like either hatch or uv and getting rid of nox for running our tests in multiple python environments.

I tried moving to a more modern Python project setup where everything is in pyproject.toml and there are no setup.cfg or setup.py files, but I couldn't get that working properly with nox.

On a semi-related note, I'd already replaced the mix of flake8, black, and isort for auto-formatting and linting with ruff which is far faster.

[tleonhardt]

#1336 handles the moving to ruff from black, isort, and flake8

[tleonhardt]

#1343 Moved the doc8 config to pyrproject.toml from setup.cfg

[tleonhardt]

#1344 Moves the mypy config to pyproject.toml from setup.cfg

[tleonhardt]

#1345 Moves pytest config to pyproject.toml from setup.cfg and deletes setup.cfg entirely

[tleonhardt]

#1364 is a PR that sets the [project] configuration in pyrproject.toml and ruggedize a couple unit tests

#1365 fully removed setup.py and relies purely on pyproject.toml for the build

[tleonhardt]

I'm going to resolve this and create a new issue for considering moving to hatch or uv

[tleonhardt]

I created #1366 to encompass the future work for moving to something like uv or hatch