Support pickling FieldArray subclasses and instances

[mhostetter]

Fixes #388

Pickle FieldArray subclasses

In [1]: import pickle

In [2]: import galois

In [3]: GF = galois.GF(47)

In [4]: print(GF.properties)
Galois Field:
  name: GF(47)
  characteristic: 47
  degree: 1
  order: 47
  irreducible_poly: x + 42
  is_primitive_poly: True
  primitive_element: 5

In [5]: with open("gf_class.pkl", "wb") as f:
   ...:     pickle.dump(GF, f)
   ...: 

In [6]: with open("gf_class.pkl", "rb") as f:
   ...:     GF_loaded = pickle.load(f)
   ...:

In [7]: print(GF_loaded.properties)
Galois Field:
  name: GF(47)
  characteristic: 47
  degree: 1
  order: 47
  irreducible_poly: x + 42
  is_primitive_poly: True
  primitive_element: 5

Pickle FieldArray instance

In [1]: import pickle

In [2]: import galois

In [3]: GF = galois.GF(47)

In [4]: x = GF.Random(10, low=1, seed=1); x
Out[4]: GF([46, 41,  7, 22, 44, 34, 24, 19, 31, 15], order=47)

In [5]: with open("gf_array.pkl", "wb") as f:
   ...:     pickle.dump(x, f)
   ...: 

In [6]: with open("gf_array.pkl", "rb") as f:
   ...:     x_loaded = pickle.load(f)
   ...: 

In [7]: x_loaded
Out[7]: GF([46, 41,  7, 22, 44, 34, 24, 19, 31, 15], order=47)

[codecov]

Codecov Report

Merging #393 (b0ff7fd) into master (d94c3b6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #393   +/-   ##
=======================================
  Coverage   95.05%   95.05%           
=======================================
  Files          42       42           
  Lines        5395     5400    +5     
=======================================
+ Hits         5128     5133    +5     
  Misses        267      267           

Impacted Files	Coverage Δ
galois/_fields/_array.py	98.85% <100.00%> (+<0.01%)	⬆️
galois/_fields/_factory.py	96.63% <100.00%> (+0.08%)	⬆️

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[mhostetter]

/fast-forward

[github-actions]

Success! Fast forwarded master to support-pickle! git checkout master && git merge support-pickle --ff-only