Refactor evaluation context out from validator state

[justin-tay]

This refactors the evaluation context from the validator state. This means that long evaluation chains no longer consume large amounts of memory as the same loaded schemas and validators can be used. The evaluation context is instead stored in the execution context.

This is unfortunately not without a cost. The performance benchmark of the schema and inputs previously used drop from 8000 ops/s to 4600 ops/s. This should still be above Everit's benchmark of around 4000 ops/s.

That said, this tradeoff is still acceptable as it makes the validator more robust in handling certain types of schemas.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 85.06494% with 92 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.91%. Comparing base (48ca3c2) to head (1cf0bf8).
⚠️ Report is 110 commits behind head on master.

Files with missing lines	Patch %	Lines
.../schema/keyword/PropertyDependenciesValidator.java	40.00%	10 Missing and 2 partials ⚠️
...networknt/schema/keyword/ItemsLegacyValidator.java	86.56%	8 Missing and 1 partial ⚠️
.../networknt/schema/keyword/DynamicRefValidator.java	62.50%	6 Missing ⚠️
...networknt/schema/keyword/PrefixItemsValidator.java	66.66%	4 Missing and 2 partials ⚠️
src/main/java/com/networknt/schema/Schema.java	93.50%	4 Missing and 1 partial ⚠️
...orknt/schema/keyword/AbstractKeywordValidator.java	83.33%	2 Missing and 3 partials ⚠️
...a/com/networknt/schema/keyword/ItemsValidator.java	58.33%	4 Missing and 1 partial ⚠️
...a/com/networknt/schema/keyword/OneOfValidator.java	81.48%	2 Missing and 3 partials ⚠️
.../main/java/com/networknt/schema/utils/Strings.java	70.58%	2 Missing and 3 partials ⚠️
...in/java/com/networknt/schema/ExecutionContext.java	80.00%	4 Missing ⚠️
... and 17 more
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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1199      +/-   ##
============================================
- Coverage     78.90%   77.91%   -1.00%     
+ Complexity     1965     1900      -65     
============================================
  Files           172      199      +27     
  Lines          6352     6596     +244     
  Branches       1255     1164      -91     
============================================
+ Hits           5012     5139     +127     
- Misses          867     1025     +158     
+ Partials        473      432      -41     

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[stevehu]

Totally agree. We should focus on stability to make it enterprise-ready. Thanks a lot for the big effort.