Provide ability to register custom assertion

[OptimumCode]

Provide interfaces and methods to allow users registering custom assertions and use them in their schemes.

Resolves #29

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (47a3f49) 89.69% compared to head (89aef93) 90.16%.

Files	Patch %	Lines
...io/github/optimumcode/json/schema/AnnotationKey.kt	86.66%	1 Missing and 1 partial ⚠️
...umcode/json/schema/internal/AnnotationCollector.kt	75.00%	0 Missing and 2 partials ⚠️
...b/optimumcode/json/schema/internal/SchemaLoader.kt	95.83%	2 Missing ⚠️
...ctories/number/ExclusiveMaximumAssertionFactory.kt	0.00%	0 Missing and 1 partial ⚠️
...ctories/number/ExclusiveMinimumAssertionFactory.kt	0.00%	0 Missing and 1 partial ⚠️
...ternal/factories/number/MaximumAssertionFactory.kt	0.00%	0 Missing and 1 partial ⚠️
...ternal/factories/number/MinimumAssertionFactory.kt	0.00%	0 Missing and 1 partial ⚠️
...nal/factories/number/MultipleOfAssertionFactory.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   89.69%   90.16%   +0.46%     
==========================================
  Files          88       90       +2     
  Lines        1980     2033      +53     
  Branches      492      499       +7     
==========================================
+ Hits         1776     1833      +57     
+ Misses         47       41       -6     
- Partials      157      159       +2     

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