Document Kotlin coroutine compatibility with extensions

[kdubb]

Description

While much of Quarkus supports Kotlin coroutines, some core extensions still do not (e.g. SmallRye Fault Tolerance and Cache).

When somebody attempts to use these extensions there is no place to check on it's compatibility with coroutines and is basically left to "try it". Many times the failures are not obviously due to coroutines and can lead the user on a bug hunt only to find out it's because they are using an incompatible extension.

The compatibility of extensions with coroutines should be documented someplace.

Implementation ideas

No response

[quarkus-bot]

/cc @evanchooly