[FlightSQL] "flightsql-kotlin" submodule for Kotlin protobuf/gRPC codegen?

[Gavin Ray]

I'm curious whether folks think it would be reasonable to upstream an
optional Kotlin submodule that uses the Kotlin code generator for FlightSQL?

Or would this be better off as a personal repository?

The Rust FlightSQL API is a fair bit nicer due to the syntax.
The Kotlin Protobuf plugin produces an API very similar:
*https://github.com/wangfenjin/arrow-datafusion/pull/1/files#diff-d942c264020a5d47b87deaca1b1064b53f3819a8f90764fad8fa3c2b9ccf6225R82-R92
<https://github.com/wangfenjin/arrow-datafusion/pull/1/files#diff-d942c264020a5d47b87deaca1b1064b53f3819a8f90764fad8fa3c2b9ccf6225R82-R92>*

This module would allow writing the below:

DiceSeries series = DiceSeries.newBuilder()
    .addRoll(DiceRoll.newBuilder()
        .setValue(5))
    .addRoll(DiceRoll.newBuilder()
        .setValue(20)
        .setNickname("critical hit"))
    .build()

As:

val series = diceSeries {
  rolls = listOf(
    diceRoll { value = 5 },
    diceRoll {
      value = 20
      nickname = "critical hit"
    }
  )
}