feat: Add never support

[fabien0102]

Why

The never keyword was forgot and could be translated by z.never()

Related issue

#24

[codecov-commenter]

Codecov Report

Merging #25 (53d3341) into main (e5e4961) will decrease coverage by 0.18%.
The diff coverage is 95.83%.

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
- Coverage   98.49%   98.30%   -0.19%     
==========================================
  Files           8        9       +1     
  Lines         332      355      +23     
  Branches      102      100       -2     
==========================================
+ Hits          327      349      +22     
  Misses          5        5              
- Partials        0        1       +1     

Impacted Files	Coverage Δ
src/utils/resolveDefaultProperties.ts	95.23% <95.23%> (ø)
src/core/generateZodSchema.ts	97.22% <100.00%> (+0.01%)	⬆️
src/core/validateGeneratedTypes.ts	97.43% <100.00%> (+0.06%)	⬆️

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