Fix schema location for escaped json pointer

[justin-tay]

Closes #1037, closes #1036

Performs the unescaping for JSON Pointer in SchemaLocation.Fragment.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 79.18%. Comparing base (48ca3c2) to head (c179682).
Report is 12 commits behind head on master.

Files	Patch %	Lines
...main/java/com/networknt/schema/SchemaLocation.java	90.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1038      +/-   ##
============================================
+ Coverage     78.90%   79.18%   +0.28%     
- Complexity     1965     1987      +22     
============================================
  Files           172      174       +2     
  Lines          6352     6438      +86     
  Branches       1255     1262       +7     
============================================
+ Hits           5012     5098      +86     
+ Misses          867      864       -3     
- Partials        473      476       +3     

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