Add id-token permission to PyPI job

[klane]

• Adds id-token permission to the PyPI job to fix an issue with trusted publishing
• Adds PyPI classifiers
• Reduces files included in sdist builds

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (11f2089) to head (819342c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #263   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          111       111           
=========================================
  Hits           111       111           

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