Adds support for validating uri-template formats

[fdutton]

Resolves #756

[codecov-commenter]

Codecov Report

Merging #758 (de09993) into master (2143b54) will increase coverage by 0.02%.
The diff coverage is 100.00%.

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@@             Coverage Diff              @@
##             master     #758      +/-   ##
============================================
+ Coverage     74.08%   74.11%   +0.02%     
- Complexity     1075     1080       +5     
============================================
  Files           111      111              
  Lines          3832     3836       +4     
  Branches        739      742       +3     
============================================
+ Hits           2839     2843       +4     
  Misses          695      695              
  Partials        298      298              

Impacted Files	Coverage Δ
...main/java/com/networknt/schema/JsonMetaSchema.java	81.35% <100.00%> (+0.15%)	⬆️

... and 1 file with indirect coverage changes