Add useful trove classifiers to pyproject.toml

[pyrco]

(DIS-1502)

[codecov[bot]]

Codecov Report

Merging #74 (c35eda3) into main (6aa3aa5) will decrease coverage by 0.44%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
- Coverage   78.76%   78.32%   -0.44%     
==========================================
  Files          32       32              
  Lines        2858     2856       -2     
==========================================
- Hits         2251     2237      -14     
- Misses        607      619      +12     

Flag	Coverage Δ
unittests	78.32% <ø> (-0.44%)	:arrow_down:

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see 6 files with indirect coverage changes

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