Refactor format validation

[justin-tay]

Closes #957, closes #848

This shouldn't contain any breaking changes, instead some methods are deprecated with some workarounds to cater to the old behavior.

This refactors the format validation to do the following

• Allow custom formats to apply to non-string values
• Refactor the logic such that all the validation logic exists in the format implementations. ie. ipv6 and date-time logic now all reside in a format implementation.
• Implement handling for unknown format. When the assertion vocab is used, unknown formats trigger an assertion. Otherwise need to set strict format to trigger an assertion.
• Refactor to use localised messages. Previously it used hardcoded english strings as the error description.

Custom Format
https://json-schema.org/draft/2020-12/json-schema-validation#name-foreword

All format attributes defined in this section apply to strings, 
but a format attribute can be specified to apply to any instance types defined in the data 
model defined in the [core JSON Schema.]

Unknown Format
https://json-schema.org/draft/2020-12/json-schema-validation#name-custom-format-attributes

When the Format-Assertion vocabulary is specified, implementations MUST fail upon encountering unknown formats.

Note that having the vocab is different from enabling assertions as an option.

[codecov-commenter]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (32356e9) 79.01% compared to head (e2ac373) 78.79%.

Files	Patch %	Lines
...ain/java/com/networknt/schema/FormatValidator.java	69.23%	5 Missing and 3 partials ⚠️
...main/java/com/networknt/schema/JsonMetaSchema.java	68.42%	5 Missing and 1 partial ⚠️
...va/com/networknt/schema/format/DateTimeFormat.java	85.71%	1 Missing and 1 partial ⚠️
...ava/com/networknt/schema/format/PatternFormat.java	84.61%	0 Missing and 2 partials ⚠️
src/main/java/com/networknt/schema/Format.java	93.33%	1 Missing ⚠️
...va/com/networknt/schema/format/DurationFormat.java	85.71%	0 Missing and 1 partial ⚠️
...com/networknt/schema/format/IdnHostnameFormat.java	80.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #958      +/-   ##
============================================
- Coverage     79.01%   78.79%   -0.23%     
- Complexity     1726     1767      +41     
============================================
  Files           158      160       +2     
  Lines          5753     5797      +44     
  Branches       1087     1080       -7     
============================================
+ Hits           4546     4568      +22     
- Misses          809      825      +16     
- Partials        398      404       +6     

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