Export / Import JSON Schema from/to PKL classes

It would be nice to generate PKL classes from JSON Schema definitions. Similarly, it can go the other way around from PKL to JSON Schema. I'm aware that the typing will be lost, but since JSON Schema is integrated pretty much everywhere, it can provide interoperability for the language.

The issue names no files, tests, or entry points. Start by locating the project's PKL and JSON Schema tooling, then define the scope of both conversion directions; done should mean that PKL classes can be exported to JSON Schema and JSON Schema definitions can generate PKL classes.

Written by the indexing model from the issue text.