Convert to normal package; add utils; move errors to utils/errors

[dwhswenson]

No description provided.

[codecov-commenter]

Codecov Report

Merging #32 (f49fe57) into main (1558a02) will increase coverage by 0.83%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   80.00%   80.83%   +0.83%     
==========================================
  Files          11       12       +1     
  Lines         115      120       +5     
==========================================
+ Hits           92       97       +5     
  Misses         23       23              

Impacted Files	Coverage Δ
openfe/utils/errors.py	100.00% <ø> (ø)
openfe/__init__.py	100.00% <100.00%> (ø)
openfe/setup/scorer.py	100.00% <100.00%> (ø)

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