Collect normal utilities into geometry/normal files

[zfergus]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.38%. Comparing base (4599790) to head (b0dfdd7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #197      +/-   ##
==========================================
+ Coverage   97.36%   97.38%   +0.01%     
==========================================
  Files         145      147       +2     
  Lines       23939    23651     -288     
  Branches      797      797              
==========================================
- Hits        23309    23033     -276     
+ Misses        630      618      -12     

Flag	Coverage Δ
unittests	97.38% <100.00%> (+0.01%)	⬆️

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