Add Galois rings

[mhostetter]

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[codecov]

Codecov Report

Merging #347 (c179ebd) into master (39ec643) will decrease coverage by 0.16%.
The diff coverage is 88.52%.

❗ Current head c179ebd differs from pull request most recent head d1d76a8. Consider uploading reports for the commit d1d76a8 to get more accurate results

@@            Coverage Diff             @@
##           master     #347      +/-   ##
==========================================
- Coverage   92.96%   92.79%   -0.17%     
==========================================
  Files          40       41       +1     
  Lines        5327     5410      +83     
==========================================
+ Hits         4952     5020      +68     
- Misses        375      390      +15     

Impacted Files	Coverage Δ
galois/_lfsr.py	84.37% <50.00%> (ø)
galois/_domains/_array.py	88.01% <71.73%> (-4.23%)	⬇️
galois/_domains/_factory.py	83.33% <83.33%> (ø)
galois/_domains/_function.py	83.81% <83.81%> (ø)
galois/_domains/_poly.py	85.66% <85.66%> (ø)
galois/_domains/_ufunc.py	91.61% <88.50%> (ø)
galois/typing.py	88.88% <88.88%> (-11.12%)	⬇️
galois/_polys/_poly.py	90.84% <90.00%> (ø)
galois/_domains/_linalg.py	95.77% <95.77%> (ø)
galois/_fields/_array.py	93.81% <96.36%> (+0.15%)	⬆️
... and 7 more

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