enforce int primitive type for enum

[omissis]

• Adds enforcing integer type for enum values
• Fixes linter complains

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (5362d2e) 77.85% compared to head (1eccf52) 61.84%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #126       +/-   ##
===========================================
- Coverage   77.85%   61.84%   -16.01%     
===========================================
  Files          12       23       +11     
  Lines        1567     2034      +467     
===========================================
+ Hits         1220     1258       +38     
- Misses        270      692      +422     
- Partials       77       84        +7     

Files	Coverage Δ
tests/data/validation/6.1.2_enum.go	0.00% <ø> (ø)
tests/data/validation/6.3.1_maxLength.go	71.42% <ø> (ø)
tests/data/validation/6.3.2_minLength.go	71.42% <ø> (ø)
pkg/generator/generate.go	75.77% <71.42%> (-0.04%)	⬇️
tests/utils.go	16.66% <16.66%> (ø)

... and 7 files with indirect coverage changes

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[omissis]

This PR replaces #103 (simply rebases it and fixes an issue coming from main`