Support enumeration types

[lonelyteapot]

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[codecov-commenter]

Codecov Report

Merging #23 (cad2eea) into main (4a9d05c) will decrease coverage by 2.17%.
The diff coverage is 82.60%.

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   97.95%   95.78%   -2.18%     
==========================================
  Files           6        7       +1     
  Lines         147      166      +19     
==========================================
+ Hits          144      159      +15     
- Misses          3        7       +4     

Impacted Files	Coverage Δ
pygraphic/_gql_enum.py	76.47% <76.47%> (ø)
pygraphic/__init__.py	100.00% <100.00%> (ø)
pygraphic/serializers.py	100.00% <100.00%> (ø)

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