updates to symmer utils and tests added

[AlexisRalli]

No description provided.

[codecov-commenter]

Codecov Report

Merging #124 (cdf9eb6) into main (e5ead6a) will increase coverage by 2.92%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
+ Coverage   80.17%   83.10%   +2.92%     
==========================================
  Files          29       30       +1     
  Lines        3037     3154     +117     
==========================================
+ Hits         2435     2621     +186     
+ Misses        602      533      -69     

Impacted Files	Coverage Δ
symmer/operators/independent_op.py	87.91% <100.00%> (+0.08%)	⬆️
symmer/utils.py	97.50% <100.00%> (+73.55%)	⬆️
tests/test_operators/test_independent_op.py	100.00% <100.00%> (ø)
tests/test_operators/test_noncontextual_op.py	99.63% <100.00%> (+0.02%)	⬆️
tests/test_symmer_utils.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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