chore: Improve debug representation of validators

[Stranger6667]

Resolves #47

[codecov]

Codecov Report

Merging #70 into master will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #70      +/-   ##
==========================================
+ Coverage   82.31%   82.55%   +0.23%     
==========================================
  Files          45       45              
  Lines        3167     3210      +43     
==========================================
+ Hits         2607     2650      +43     
  Misses        560      560              

Impacted Files	Coverage Δ
src/keywords/additional_items.rs	95.00% <100.00%> (-0.17%)	⬇️
src/keywords/additional_properties.rs	86.71% <100.00%> (+0.42%)	⬆️
src/keywords/all_of.rs	93.54% <100.00%> (ø)
src/keywords/any_of.rs	93.10% <100.00%> (ø)
src/keywords/boolean.rs	81.48% <100.00%> (ø)
src/keywords/const_.rs	100.00% <100.00%> (ø)
src/keywords/contains.rs	96.55% <100.00%> (ø)
src/keywords/content.rs	94.39% <100.00%> (ø)
src/keywords/dependencies.rs	95.23% <100.00%> (+0.23%)	⬆️
src/keywords/enum_.rs	95.83% <100.00%> (ø)
... and 26 more

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