Support DFT over arbitrary fields

[mhostetter]

No description provided.

[codecov]

Codecov Report

Merging #335 (eaf1043) into master (fcd7c97) will increase coverage by 0.21%.
The diff coverage is 43.18%.

@@            Coverage Diff             @@
##           master     #335      +/-   ##
==========================================
+ Coverage   92.40%   92.62%   +0.21%     
==========================================
  Files          30       30              
  Lines        5203     5234      +31     
==========================================
+ Hits         4808     4848      +40     
+ Misses        395      386       -9     

Impacted Files	Coverage Δ
galois/_fields/_functions.py	85.14% <41.86%> (+2.23%)	⬆️
galois/_ntt.py	94.33% <100.00%> (ø)
galois/_fields/_main.py	90.57% <0.00%> (+0.07%)	⬆️
galois/_fields/_factory.py	96.70% <0.00%> (+0.25%)	⬆️
galois/_poly_conversion.py	98.18% <0.00%> (+0.90%)	⬆️

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