Optimize getValueNodeType

[justin-tay]

Optimized the performance of the type validator by refactoring getValueNodeType.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.

Project coverage is 78.72%. Comparing base (48ca3c2) to head (9b6de48).
Report is 17 commits behind head on master.

Files	Patch %	Lines
...rc/main/java/com/networknt/schema/TypeFactory.java	91.66%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1048      +/-   ##
============================================
- Coverage     78.90%   78.72%   -0.19%     
- Complexity     1965     2030      +65     
============================================
  Files           172      191      +19     
  Lines          6352     6589     +237     
  Branches       1255     1260       +5     
============================================
+ Hits           5012     5187     +175     
- Misses          867      927      +60     
- Partials        473      475       +2     

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