Adds support for validating an IRI

[fdutton]

Resolves #767

[codecov-commenter]

Codecov Report

Merging #768 (328c546) into master (cb7c53b) will increase coverage by 0.02%.
The diff coverage is 95.23%.

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@@             Coverage Diff              @@
##             master     #768      +/-   ##
============================================
+ Coverage     74.24%   74.26%   +0.02%     
- Complexity     1087     1089       +2     
============================================
  Files           115      116       +1     
  Lines          3851     3855       +4     
  Branches        742      742              
============================================
+ Hits           2859     2863       +4     
- Misses          693      694       +1     
+ Partials        299      298       -1     

Impacted Files	Coverage Δ
...networknt/schema/format/AbstractRFC3986Format.java	100.00% <ø> (ø)
...in/java/com/networknt/schema/format/UriFormat.java	100.00% <ø> (ø)
...om/networknt/schema/format/UriReferenceFormat.java	100.00% <ø> (ø)
...in/java/com/networknt/schema/format/IriFormat.java	66.66% <66.66%> (ø)
...main/java/com/networknt/schema/JsonMetaSchema.java	82.25% <100.00%> (+0.14%)	⬆️
...om/networknt/schema/format/IriReferenceFormat.java	100.00% <100.00%> (ø)
.../java/com/networknt/schema/format/RegexFormat.java	85.71% <100.00%> (ø)
...n/java/com/networknt/schema/format/TimeFormat.java	84.61% <100.00%> (ø)

... and 1 file with indirect coverage changes