Build with setuptools instead of hatch

[mdekstrand]

This replaces hatchling with setuptools, since we weren't actually using any Hatch capabilities.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.42%. Comparing base (cf0574c) to head (52e9054).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #710   +/-   ##
=======================================
  Coverage   90.42%   90.42%           
=======================================
  Files         137      137           
  Lines        9556     9556           
=======================================
  Hits         8641     8641           
  Misses        915      915           

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