Introduce masterServiceAnnotations & replicaServiceAnnotations (#2161)

* 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>

manifests/postgresql.crd.yaml

@@ -221,6 +221,10 @@ spec:
                 items:
                   type: string
                   pattern: '^\ *((Mon|Tue|Wed|Thu|Fri|Sat|Sun):(2[0-3]|[01]?\d):([0-5]?\d)|(2[0-3]|[01]?\d):([0-5]?\d))-((Mon|Tue|Wed|Thu|Fri|Sat|Sun):(2[0-3]|[01]?\d):([0-5]?\d)|(2[0-3]|[01]?\d):([0-5]?\d))\ *$'
+              masterServiceAnnotations:
+                type: object
+                additionalProperties:
+                  type: string
               nodeAffinity:
                 type: object
                 properties:
@@ -400,6 +404,10 @@ spec:
               replicaLoadBalancer:
                 type: boolean
                 description: deprecated
+              replicaServiceAnnotations:
+                type: object
+                additionalProperties:
+                  type: string
               resources:
                 type: object
                 properties: