[language support] Scala

Scala runs natively on the JVM, so it should be possible to integrate with a Scala-based generator. I'm not sure about using Kotlin code to write the custom formatter, however, but I think it should work if Scala can understand it as regular Java code.

Formatter options:
- [Scaladoc](https://docs.scala-lang.org/overviews/scaladoc/overview.html)

Begin with the Scaladoc overview linked in the issue and review how Kodiak’s current formatter integrations are organized. Confirm whether Scala can consume the Kotlin/JVM formatter approach; done means Scala support is integrated and produces the expected JSON model.

Written by the indexing model from the issue text.