Move project metadata to pyproject.toml; avoid calling setup.py

[mwtoews]

Overview

The PR utilizes pyproject.toml for project metadata and build dependencies, and uses PyPA's build tool instead of invoking setup.py directly.

Details

• Specifies project build dependencies (PEP 518), i.e. it's just setuptools. This means you don't need to pip install any thing before installing this package
• Moves project metadata from setup.py to pyproject.toml, see setuptools docs and PEP 621
  • This is close to a 1:1 conversion, with a few small modifications such as alphasorting lists
  • Explicit listing of packages is replaced with setuptools' find() to gather everything under "pyvista*"
  • Out in the wild, most folks and docs seem to prefer double quotes, but this PR maintains the current style using mostly single quotes (except keys)
• While setup.py is nearly empty, keep it for now, since some packages depend on it
• Calling setup.py is discouraged; use PyPA's build tool instead
• Use twine check --strict dist/* to fail CI check if needed

[codecov]

Codecov Report

Merging #3619 (9675ccb) into main (3b97cab) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3619   +/-   ##
=======================================
  Coverage   95.11%   95.11%           
=======================================
  Files          83       83           
  Lines       18558    18558           
=======================================
  Hits        17652    17652           
  Misses        906      906           

[akaszynski]

Excellent work. Thanks for adding it, and I appreciate barely around setup.py so we can support legacy installs until it completely goes away.

I'm also happy we're no longer reading in the __version__ from file, thanks for refactoring that out.

[banesullivan]

Excellent! Thank you for taking the initiative on this as a few of us have wanted/talked about doing this for a while