Optimize logging by creating a debug flag

[justin-tay]

This creates a debugEnabled flag in ExecutionConfig that is checked to determine if the debug logs should be generated. This is a performance optimization as it was noticed during profiling that since this debug function runs very frequently during validation execution the time taken just to determine if the logger is enabled is significant.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.68750% with 13 lines in your changes missing coverage. Please review.

Project coverage is 78.66%. Comparing base (48ca3c2) to head (da43eb8).
Report is 23 commits behind head on master.

Files	Patch %	Lines
...n/java/com/networknt/schema/BaseJsonValidator.java	0.00%	9 Missing and 1 partial ⚠️
...ain/java/com/networknt/schema/ExecutionConfig.java	50.00%	2 Missing ⚠️
...java/com/networknt/schema/DynamicRefValidator.java	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1054      +/-   ##
============================================
- Coverage     78.90%   78.66%   -0.24%     
- Complexity     1965     2018      +53     
============================================
  Files           172      190      +18     
  Lines          6352     6526     +174     
  Branches       1255     1244      -11     
============================================
+ Hits           5012     5134     +122     
- Misses          867      921      +54     
+ Partials        473      471       -2     

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