Allow to specify list of fields in impl_deserialize_for_internally_tagged_enum! macro

[Mingun]

New parameter allow to use that macro for the types which contains $value field, as in #928.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.37%. Comparing base (d1acdb5) to head (00a4469).
⚠️ Report is 17 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #929      +/-   ##
==========================================
+ Coverage   58.08%   58.37%   +0.28%     
==========================================
  Files          42       44       +2     
  Lines       15513    15804     +291     
==========================================
+ Hits         9011     9225     +214     
- Misses       6502     6579      +77     

Flag	Coverage Δ
unittests	58.37% <100.00%> (+0.28%)	⬆️

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