Add pyproject validation

[blink1073]

Use https://github.com/abravalheri/validate-pyproject to validate the pyproject.toml, including trove classifiers.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.51%. Comparing base (bf26b59) to head (62bee8c).
Report is 332 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1020      +/-   ##
==========================================
- Coverage   72.57%   72.51%   -0.07%     
==========================================
  Files          64       64              
  Lines        8251     8251              
  Branches     1257     1257              
==========================================
- Hits         5988     5983       -5     
- Misses       1848     1852       +4     
- Partials      415      416       +1     

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