Adds JsonNodeReader

[justin-tay]

Adds an JsonNodeReader interface to abstract out the logic for reading content into a JsonNode.

This will make it easier to customize how the reading is done with a custom implementation. This also potentially allows easier reuse of the logic of reading location aware nodes by trying to decouple this from the JsonSchemaFactory.

This deprecates the setting of jsonMapper and yamlMapper on the JsonSchemaFactory in favor of the jsonNodeReader.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.28571% with 15 lines in your changes missing coverage. Please review.

Project coverage is 78.68%. Comparing base (48ca3c2) to head (8953fe8).
Report is 31 commits behind head on master.

Files	Patch %	Lines
...nt/schema/serialization/DefaultJsonNodeReader.java	60.60%	9 Missing and 4 partials ⚠️
...n/java/com/networknt/schema/JsonSchemaFactory.java	75.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1065      +/-   ##
============================================
- Coverage     78.90%   78.68%   -0.22%     
- Complexity     1965     2053      +88     
============================================
  Files           172      198      +26     
  Lines          6352     6635     +283     
  Branches       1255     1249       -6     
============================================
+ Hits           5012     5221     +209     
- Misses          867      936      +69     
- Partials        473      478       +5     

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