add mypy check on generated code

[tlambert03]

runs mypy check on both checked in source as well as the autogenerated model code on CI

[codecov-commenter]

Codecov Report

Merging #12 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #12      +/-   ##
==========================================
+ Coverage   95.20%   95.22%   +0.02%     
==========================================
  Files           1        1              
  Lines         396      398       +2     
==========================================
+ Hits          377      379       +2     
  Misses         19       19              

Impacted Files	Coverage Δ
src/ome_autogen.py	95.22% <100.00%> (+0.02%)	⬆️

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