Add CNPG's cluster as an optional way to deploy a postgres cluster with this chart?

[jessebot]

I use the Cloud native postgres operator for my personal deployments of anything with a postgres cluster requirement. I can't be the only one who does, as it offers TLS, backups (on demand and scheduled including wal archives and works with local S3 instances), restores, and other scaling features.

The operator helm chart is pretty solid, but when we first started using this operator, it didn't yet have the cloudnative-pg/charts cluster helm chart available, meaning we rolled our own, small-hack/cloudnative-pg-cluster-chart. Now that it's out, although still in development, perhaps we integrate it as an optional way to deploy postgresql with this chart?

Potential blockers

1. I am unsure if the cloudnative-pg/charts cluster helm chart](https://github.com/cloudnative-pg/charts/tree/main/charts/cluster) has TLS working for it. This is something we've rolled into our small-hack/cloudnative-pg-cluster-chart, so if it's not available, we can submit an issue/PR to the official repo, and just use the small-hack chart for now

Context

Open to any suggestions or feelings on the matter :)