Kotlin-JVM support (protobuf >=3.17.0)

[Zetten]

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The upstream projects seem to have been working on adding support for Kotlin (at least Kotlin-JVM flavour): Protobuf in protobuf v3.17.0 and gRPC with grpc-kotlin v1.1.0.

Obviously in a pinch the Java libraries do the trick, but there are some nice integrations in the Kotlin-specific code, so it would be great if this support could be extended to these rules, once the baseline is updated.

[aaliddell]

👍

It looks like all the pieces are there for this to work ok. I might need some help with the example code for the tests though, since I’ve never written a line of Kotlin before 🙂