Improve logging performance

[valfirst]

Explanation of changes: https://www.slf4j.org/faq.html#logging_performance

[codecov-commenter]

Codecov Report

Merging #649 (3167d4f) into master (5645d56) will increase coverage by 0.11%.
The diff coverage is 41.66%.

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@@             Coverage Diff              @@
##             master     #649      +/-   ##
============================================
+ Coverage     70.71%   70.83%   +0.11%     
  Complexity      985      985              
============================================
  Files           100      100              
  Lines          3732     3730       -2     
  Branches        780      779       -1     
============================================
+ Hits           2639     2642       +3     
+ Misses          818      816       -2     
+ Partials        275      272       -3     

Impacted Files	Coverage Δ
...ain/java/com/networknt/schema/FormatValidator.java	91.30% <0.00%> (ø)
...in/java/com/networknt/schema/PatternValidator.java	34.92% <0.00%> (ø)
...main/java/com/networknt/schema/JsonMetaSchema.java	80.70% <33.33%> (ø)
...etworknt/schema/AdditionalPropertiesValidator.java	75.00% <100.00%> (+1.19%)	⬆️
...n/java/com/networknt/schema/BaseJsonValidator.java	73.33% <100.00%> (+1.43%)	⬆️
...n/java/com/networknt/schema/DateTimeValidator.java	86.66% <100.00%> (ø)
...n/java/com/networknt/schema/JsonSchemaFactory.java	79.89% <100.00%> (+0.97%)	⬆️

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[stevehu]

Makes perfect sense. Thanks a lot for your help.