Implementation for using enum values in schema

[patrick91]

Description

This PR allows to use enum values in generated enums. It is still WIP :)

Also we should probably warn when users use enum values that aren't supported by the schema 😊

Types of Changes

• [x] Core
• [ ] Bugfix
• [x] New feature
• [x] Enhancement/optimization
• [ ] Documentation

Issues Fixed or Closed by This PR

• Closes #370

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.90909% with 3 lines in your changes missing coverage. Please review.

Project coverage is 98.08%. Comparing base (f25ac4b) to head (77f0298). Report is 1470 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1653      +/-   ##
==========================================
- Coverage   98.16%   98.08%   -0.09%     
==========================================
  Files         129      130       +1     
  Lines        4532     4549      +17     
  Branches      781      781              
==========================================
+ Hits         4449     4462      +13     
- Misses         43       45       +2     
- Partials       40       42       +2     

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