Format repo and use formatter workflow (2nd try)

[JoshuaLampert]

See #86.

[codecov]

Codecov Report

Attention: Patch coverage is 88.63636% with 5 lines in your changes missing coverage. Please review.

Project coverage is 90.50%. Comparing base (41c5dfe) to head (c6a5837).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils.jl	33.33%	4 Missing ⚠️
src/specializations/BezierCurve.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
+ Coverage   90.35%   90.50%   +0.15%     
==========================================
  Files          16       16              
  Lines         311      316       +5     
==========================================
+ Hits          281      286       +5     
  Misses         30       30              

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[mikeingold]

I just pushed a commit to tweak a few lines in the test section, mostly just to condense a few lines that were being split in two.