feat(cluster): Add replication slots configuration

[dragoangel]

implements: #354

[itay-grudev]

Can you replace this with:

  replicationSlots: {}
   # highAvailability:
   #   enabled: true
   #   slotPrefix: _cnpg_
   #   updateInterval: "30"

and then re-run make schema docs.

Otherwise the generated schema is incorrect and would not allow otherwise valid configurations. This way it would only validate whether it's passed an object.

[dragoangel]

Sorry, I not get a bit what you mean. This will be this way, what else can be set outside of this schema?

I specially set highAvailability, as it always has place even when it unset in CRD, it just turned on by default with this settings.

[itay-grudev]

Refer to the API reference here: https://cloudnative-pg.io/documentation/current/cloudnative-pg.v1/#postgresql-cnpg-io-v1-ReplicationSlotsConfiguration

[itay-grudev]

The problem is that our schema is auto generated based on values, so it will assume the structure you provided, which is incomplete. Run make schema.

[dragoangel]

I found and fixed issue, thanks