Add GraalVM based script engine for Datamapper and Script mediator

[arunans23]

As the Nashorn was deprecated with the JDK 11, the Datamapper and Script mediator's script engine needs to be changed to another JS engine.

Since GraalJS provides several performance improvements, the runtime should be updated to utilize GraalVM instead of the old Rhino engine.

Tasks to be completed

• Pack GraalJS to runtime
• Change the docs with the new implementation
• Run tests for backward compatibility
• Run performance tests and update the docs.