Add possibility to add extra Service Selector

[belfo]

Hello,

currently it's possible to add extra label / annotation to the cluster service created by the operator: https://github.com/oracle/weblogic-kubernetes-operator/blob/main/documentation/domains/Cluster.md#cluster-service

Would be possible to add the possibility to add extra Selector?

I need to differentiate the different running app inside the cluster, and use a custom label to identify the pod.

Regards