Kubernetes support

[marsupialtail]

This is a long running issue on trying to make Quokka work on Kubernetes.

Currently Quokka works on a Dockerized setup on a Ray cluster, so the leap to Kubernetes is probably not big. We can also refer to how Spark works on Kubernetes: https://spark.apache.org/docs/latest/running-on-kubernetes.html

We can probably get started with assuming that Quokka pods will not get pre-empted. If pods do get pre-empted, Quokka does not tolerate coordinator failures.