Kotlin support

[karesti]

Provide or document Kotlin support for protostream

Related

quarkusio/quarkus#45823

[karesti]

Reproducer without Quarkus infinispan/infinispan-simple-tutorials#319

[karesti]

I think we should be able to do something like this:

@Proto
@JvmRecord
data class Person(val name: String, val age: Int)

[karesti]

Or like this:

@Proto
data class GreetingKotlin(@JvmField var name: String?=null,
                          @JvmField var greeting: String?=null)