Improves performance

[fdutton]

• Delays detecting the schema version until actually needed.
• Reduces the number of redundant calls to CollectorContext.getInstance().
• Precomputes keyword versions.
• Replaces the use of HashSet due to poor performance

Resolves #721

Initial validation :11 ms
Iteration 0 (in 2 ms)
Iteration 20 (in 30 ms)
Iteration 40 (in 50 ms)
Iteration 60 (in 68 ms)
Iteration 80 (in 84 ms)
Iteration 100 (in 100 ms)
Iteration 120 (in 112 ms)
Iteration 140 (in 125 ms)
Iteration 160 (in 138 ms)
Iteration 180 (in 150 ms)
Iteration 200 (in 161 ms)
Iteration 220 (in 169 ms)
Iteration 240 (in 176 ms)
Iteration 260 (in 184 ms)
Iteration 280 (in 192 ms)
Iteration 300 (in 202 ms)
Iteration 320 (in 210 ms)
Iteration 340 (in 217 ms)
Iteration 360 (in 224 ms)
Iteration 380 (in 231 ms)
Iteration 400 (in 238 ms)
Iteration 420 (in 250 ms)
Iteration 440 (in 259 ms)
Iteration 460 (in 266 ms)
Iteration 480 (in 273 ms)
END -- time in ms: 280

[codecov-commenter]

Codecov Report

Merging #731 (606439e) into master (cff8961) will increase coverage by 0.04%.
The diff coverage is 97.11%.

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@@             Coverage Diff              @@
##             master     #731      +/-   ##
============================================
+ Coverage     75.34%   75.39%   +0.04%     
+ Complexity     1054     1048       -6     
============================================
  Files           106      106              
  Lines          3630     3637       +7     
  Branches        717      718       +1     
============================================
+ Hits           2735     2742       +7     
+ Misses          617      616       -1     
- Partials        278      279       +1     

Impacted Files	Coverage Δ
...rc/main/java/com/networknt/schema/SpecVersion.java	90.90% <ø> (-9.10%)	⬇️
...in/java/com/networknt/schema/CollectorContext.java	84.21% <66.66%> (-0.41%)	⬇️
...n/java/com/networknt/schema/uri/URITranslator.java	81.08% <90.90%> (+8.00%)	⬆️
.../java/com/networknt/schema/utils/JsonNodeUtil.java	64.06% <90.90%> (+1.76%)	⬆️
...etworknt/schema/AdditionalPropertiesValidator.java	72.72% <100.00%> (-0.35%)	⬇️
...main/java/com/networknt/schema/AllOfValidator.java	93.22% <100.00%> (+0.11%)	⬆️
...main/java/com/networknt/schema/AnyOfValidator.java	91.66% <100.00%> (+0.11%)	⬆️
...rc/main/java/com/networknt/schema/IfValidator.java	87.50% <100.00%> (+0.22%)	⬆️
src/main/java/com/networknt/schema/JsonSchema.java	90.32% <100.00%> (+0.04%)	⬆️
...c/main/java/com/networknt/schema/NotValidator.java	73.91% <100.00%> (+1.18%)	⬆️
... and 7 more