Add Java bindings for the transformer and validator

[rhamzeh]

We currently have bindings to support JS and Golang, with the following features supported in each.

Feature	Go	JS
Transformer from the DSL to JSON and from JSON to DSL	✅	✅
Syntactic Model Validations	✅	✅
Semantic Model Validations	❌ (planned)	✅
Graphing & Utility Methods	❌ (planned)	❌ (planned)

In order to progress in our support for a Jetbrains Plugin, we will need to add Java bindings that handle the same features.

The Java bindings should run against the same set of checks as the other implementations (JS tests, Test Definitions)

The exposed methods should match the ones for JS and Go

• transformer
  • transformJSONToDSL
  • transformDSLToJSON
• validator
  • validateDSL
  • validateJSON