Check type validator is of correct class

[justin-tay]

Explicitly check that the type validator is of type TypeValidator before using to prevent a java.lang.ClassCastException in the event a meta-schema uses a different validator for instance if the standard validation vocab isn't used.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.80%. Comparing base (61323ba) to head (bde0500).

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Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1003   +/-   ##
=========================================
  Coverage     78.79%   78.80%           
- Complexity     1959     1960    +1     
=========================================
  Files           172      172           
  Lines          6344     6345    +1     
  Branches       1252     1253    +1     
=========================================
+ Hits           4999     5000    +1     
  Misses          876      876           
  Partials        469      469           

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