Add new Misk Kotlin Server Generator

[andrewwilsonnew]

Is your feature request related to a problem? Please describe.

Looking to build and support a new generator for Misk

Describe the solution you'd like

A new generator that builds:

• Proto classes for the model which are compiled with Wire
• Generated kotlin classes for the api

Describe alternatives you've considered

n/a

Additional context

Misk is an Apache2.0 Open Source Web Container written in Kotlin

[andrewwilsonnew]

I don't seem to be able to assign or add labels - guessing admins have to do this... do I need write access eventually?

I've made a Draft PR #20885