Add codegen filter to ModelV2 (maybe)

[leovalais]

Doesn't seem to help with compilation times, not sure if it's worth keeping the option, TBD

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.49%. Comparing base (f2d6885) to head (19a2ddb).

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Additional details and impacted files

@@              Coverage Diff              @@
##                dev    #7898       +/-   ##
=============================================
+ Coverage     28.07%   87.49%   +59.41%     
=============================================
  Files          1289       31     -1258     
  Lines        157794     1535   -156259     
  Branches       3121        0     -3121     
=============================================
- Hits          44301     1343    -42958     
+ Misses       111616      192   -111424     
+ Partials       1877        0     -1877     

Flag	Coverage Δ
core	?
editoast	?
front	?
gateway	?
railjson_generator	87.49% <ø> (ø)
tests	?

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