Support vocabulary customization in custom meta-schemes

[OptimumCode]

Resolves #46

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (38cca63) 90.11% compared to head (ea144fd) 90.51%.

Files	Patch %	Lines
...a/internal/config/Draft201909SchemaLoaderConfig.kt	61.53%	2 Missing and 3 partials ⚠️
...a/internal/config/Draft202012SchemaLoaderConfig.kt	78.26%	2 Missing and 3 partials ⚠️
...in/io/github/optimumcode/json/schema/SchemaType.kt	60.00%	1 Missing and 3 partials ⚠️
...b/optimumcode/json/schema/internal/SchemaLoader.kt	91.89%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
+ Coverage   90.11%   90.51%   +0.39%     
==========================================
  Files          90       90              
  Lines        2033     2087      +54     
  Branches      508      520      +12     
==========================================
+ Hits         1832     1889      +57     
+ Misses         42       40       -2     
+ Partials      159      158       -1     

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