Main refactor for 2.x

[justin-tay]

This pull request forms the bulk of changes for 2.x.

The next change will be to refactor the evaluation state out of the validators. This reduces the out of memory issues when schemas use a lot of oneOf, anyOf, allOf but impacts performance.

Major Changes

• Configuration on a per Schema basis is no longer possible and is done on the Factory instead
• Removal of deprecated methods and functionality from 1.x.
• Major renaming of many of the public APIs and moving of classes into sub-packages.
• Errors are returned as a List instead of a Set.
• Error messages do not have the instanceLocation as part of the message
• External resources will not be automatically fetched by default. This now requires opt-in via configuration.
  • This is to conform to the specification that requires such functionality to be disabled by default to prefer offline operation. Note however that classpath resources will still be automatically loaded.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 82.13935% with 364 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.18%. Comparing base (48ca3c2) to head (8c31de4).
⚠️ Report is 104 commits behind head on master.

Files with missing lines	Patch %	Lines
...main/java/com/networknt/schema/SchemaRegistry.java	81.37%	27 Missing and 11 partials ⚠️
src/main/java/com/networknt/schema/Schema.java	72.38%	32 Missing and 5 partials ⚠️
...tworknt/schema/keyword/DiscriminatorValidator.java	57.37%	16 Missing and 10 partials ⚠️
...ava/com/networknt/schema/SchemaRegistryConfig.java	80.70%	22 Missing ⚠️
...va/com/networknt/schema/resource/SchemaLoader.java	75.60%	16 Missing and 4 partials ⚠️
...ain/java/com/networknt/schema/dialect/Dialect.java	67.34%	10 Missing and 6 partials ⚠️
...networknt/schema/dialect/BasicDialectRegistry.java	31.81%	13 Missing and 2 partials ⚠️
.../networknt/schema/keyword/DynamicRefValidator.java	48.14%	10 Missing and 4 partials ⚠️
.../schema/keyword/PropertyDependenciesValidator.java	72.91%	10 Missing and 3 partials ⚠️
...tworknt/schema/dialect/DefaultDialectRegistry.java	36.84%	11 Missing and 1 partial ⚠️
... and 49 more
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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1198      +/-   ##
============================================
- Coverage     78.90%   78.18%   -0.73%     
+ Complexity     1965     1935      -30     
============================================
  Files           172      199      +27     
  Lines          6352     6564     +212     
  Branches       1255     1161      -94     
============================================
+ Hits           5012     5132     +120     
- Misses          867      999     +132     
+ Partials        473      433      -40     

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