Add more non-abelian tests

[ogauthe]

This is a pure test PR. It adds more tests for non-abelian and SectorProduct operations.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.33%. Comparing base (5472a79) to head (8b071a7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #78   +/-   ##
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  Coverage   91.33%   91.33%           
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  Files          11       11           
  Lines         612      612           
=======================================
  Hits          559      559           
  Misses         53       53           

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[mtfishman]

Looks good, thanks for the nice tests! Glad to see so much functionality already works for non-abelian and product sectors.