Move from setup.py to pyproject.toml

[jakirkham]

Increasingly there is a move by Python projects to use pyproject.toml to declare their metadata and dependencies and away from setup.py. Raising this issue to start discussion around how to approach this in Dask.

dask/dask#10032

[jrbourbeau]

Thanks @jakirkham! I'll suggest we consolidate conversation over in dask/dask#10032 for the time being. My guess is we'll end up doing the same thing, at the same time, in dask/dask and dask/distributed

[graingert]

@jakirkham which build tool do we want to use eventually? I have a PR open #7629 which uses setuptools and versioneer via PEP 517, but what is the end goal? Should we be aiming at hatch?

[jakirkham]

Continuing to use setuptools and versioneer makes sense. If we want to move to something else, that can be handled as a separate discussion