Make Vert.x Future compatible with Kotlin's Coroutine

[miere]

[termermc]

What do you think would be needed to implement this? I'm interested in using your project, but the way I compose code now, handlers are always suspend functions. In the past, I made an internal framework similar to this that unfortunately used reflection, but it did have support for suspend functions.

The only practical difference in the underlying call structure of a suspend function is that it takes an extra argument for the continuation. That part is of course abstracted away in Kotlin itself, but it's still there in the JVM signature.