Enhancement: Implement SchemaValidator

[localheinz]

This pull request

• implements SchemaValidator

[codecov]

Codecov Report

Merging #8 (31abb96) into main (1e03cf1) will increase coverage by 0.92%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main       #8      +/-   ##
============================================
+ Coverage     96.96%   97.89%   +0.92%     
- Complexity       29       38       +9     
============================================
  Files             8        9       +1     
  Lines            66       95      +29     
============================================
+ Hits             64       93      +29     
  Misses            2        2              

Impacted Files	Coverage Δ	Complexity Δ
src/SchemaValidator.php	100.00% <100.00%> (ø)	9.00 <9.00> (?)

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