🔧 MAINTAIN: Move from setuptools to flit for package build

[chrisjsewell]

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[codecov-commenter]

Codecov Report

Merging #58 (7f0a943) into main (6a412a1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #58   +/-   ##
=======================================
  Coverage   88.51%   88.51%           
=======================================
  Files          10       10           
  Lines         914      914           
=======================================
  Hits          809      809           
  Misses        105      105           

Flag	Coverage Δ
pytests	88.51% <ø> (ø)

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