* Introduce `masterServiceAnnotations` & `replicaServiceAnnotations`
Introduce `masterServiceAnnotations` & `replicaServiceAnnotations` to the `Postgresql` CRD.
`masterServiceAnnotations` overrides `serviceAnnotations` for master role if not empty.
`replicaServiceAnnotations` overrides `serviceAnnotations` for replica role if not empty.
Existing definition of `serviceAnnotations` continue to work for backward compatibitlity when neither `masterServiceAnnotations` nor `replicaServiceAnnotations` is defined.
This closes https://github.com/zalando/postgres-operator/issues/1927
* Accumulate service annotations
First, global config, then ServiceAnnotations overriding, then MasterServiceAnnotations and ReplicaServiceAnnotations.
This addresses
https://github.com/zalando/postgres-operator/pull/2161#discussion_r1063558711.
* Update admin doc with master & replica service annotations overrides
Addressed https://github.com/zalando/postgres-operator/pull/2161#discussion_r1064744086
Co-authored-by: Felix Kunde <felix-kunde@gmx.de>