Updated package infrastructure to use pyproject.toml

[astrofrog]

Just some cleanup of the infrastructure

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.77%. Comparing base (dffe87d) to head (8f8eb9a).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   96.70%   96.77%   +0.07%     
==========================================
  Files          18       18              
  Lines        2274     2356      +82     
==========================================
+ Hits         2199     2280      +81     
- Misses         75       76       +1     

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