feat: add NativeEnum validator

[vladfrangu]

Closes #48

[codecov-commenter]

Codecov Report

Merging #54 (468937b) into main (793648b) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   97.49%   97.61%   +0.11%     
==========================================
  Files          41       43       +2     
  Lines        1079     1133      +54     
  Branches      222      230       +8     
==========================================
+ Hits         1052     1106      +54     
  Misses         23       23              
  Partials        4        4              

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (ø)
src/lib/Shapes.ts	100.00% <100.00%> (ø)
src/lib/errors/UnknownEnumValueError.ts	100.00% <100.00%> (ø)
src/validators/BaseValidator.ts	100.00% <100.00%> (ø)
src/validators/DefaultValidator.ts	77.77% <100.00%> (ø)
src/validators/NativeEnumValidator.ts	100.00% <100.00%> (ø)

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