feature request: read-only replicas service

[mbrancato]

It would be nice if there was a way in the Operator to define two separate sets of replicas. One for read-write usage, and one for read-only. While these would all be replicas, part of a single shard, and technically all be read-write (from what I understand), the operator could help here be placing specific read-only labels on the CHI that are for Select queries. Then a separate Kubernetes Service resource that only points to those CHI only could be used.

I know this a simple explanation, and gets more complex with multiple shards. There are some ways to do this in the existing operator, but a nice interface in the CRD would be great.