fix: Skip non-init fields in dataclasses.

[pawamoy]

Closes #181.

[pawamoy]

The type-checking error could be fixed by changing the annotation of Field.metadata to Mapping, or by making an actual dict of metadata with dict(f.metadata). Or we can type-ignore it, let me know.

[DanCardin]

i'd probably dict it personally, for making a type that can be consistent across the various types.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (23a0be3) to head (ac2a2ea).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #183   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           25        25           
  Lines         2308      2310    +2     
  Branches       500       501    +1     
=========================================
+ Hits          2308      2310    +2     

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