Add support for Java 14 Records

[niloc132]

Implements records as Java objects, so they can be transpiled to JS. Unlike in Java bytecode, hashCode/toString/equals have a complete implementation, rather than using method references and constant bootstrap to generate code at runtime.

Before ready to review:

• Finish three remaining TODOs in the ast builder.
• Add more tests to confirm user code can replace generated implementations.
• Fix formatting.
• Resolve conflicts in records in jsinterop spec, and test and implement any modified restrictions/constraints. This may be moved to a separate issue.

Fixes #9894

[niloc132]

Proposed jsinterop spec changes are implemented - building more tests now, then should be ready for review.