Support GraalVM and refactor

[justin-tay]

This adds support for GraalVM by adding native-image.properties and some refactoring.

[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (bd085ed) 78.67% compared to head (66b6ff3) 78.75%.

Files	Patch %	Lines
...n/java/com/networknt/schema/AnnotationKeyword.java	72.22%	2 Missing and 3 partials ⚠️
...n/java/com/networknt/schema/BaseJsonValidator.java	73.33%	3 Missing and 1 partial ⚠️
...om/networknt/schema/resource/MetaSchemaMapper.java	81.81%	0 Missing and 2 partials ⚠️
...in/java/com/networknt/schema/ExecutionContext.java	94.11%	1 Missing ⚠️
...n/java/com/networknt/schema/ValidationMessage.java	83.33%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #972      +/-   ##
============================================
+ Coverage     78.67%   78.75%   +0.08%     
- Complexity     1835     1850      +15     
============================================
  Files           162      164       +2     
  Lines          5941     5987      +46     
  Branches       1138     1146       +8     
============================================
+ Hits           4674     4715      +41     
- Misses          835      837       +2     
- Partials        432      435       +3     

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