Fix incorrect URI resolution when root schema $id is not an absolute URI

[OptimumCode]

Resolves #87

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 91.43%. Comparing base (ed1a780) to head (fcd0248).

Files	Patch %	Lines
...b/optimumcode/json/schema/internal/SchemaLoader.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
- Coverage   91.46%   91.43%   -0.04%     
==========================================
  Files         104      104              
  Lines        2356     2358       +2     
  Branches      603      604       +1     
==========================================
+ Hits         2155     2156       +1     
  Misses         36       36              
- Partials      165      166       +1     

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