Option to configure annotations for leader-headless service only

[arpan57]

Is your feature request related to a problem? Please describe.
I am trying to use additional annotations in order to work with exernal-dns. Using the recent operator upgrade PR (#1219) we are able to configure additional annotations for headless services.
However, currently the operator adds annotations for both leader-headless and follower-headless services.

Describe the solution you'd like

We should have an option to choose if we want to enable additionalannotations for leader-headless or follower-headless or for both. We do not want to add these annotations for follower services.

Ideal solution would be to have separate service template like charts/redis-cluster/templates/leader-service.yaml and like charts/redis-cluster/templates/follower-service.yaml for leader-headless and follower-headless services. Where we have an option to configure headless services.

Describe alternatives you've considered

Patching k8sutils/labels.go file method - generateServiceAnots - add an if condition to check if its for leader or for follower. If for follower skip the additional annotations - well that's only for our usecase.
I also tried 'hacking' external service templates leader-service.yaml and follower-service.yaml - which creates additional services with ClusterIP - None

What version of redis-operator are you using?

redis-operator version: 0.19.1

Additional context

Additionally
Apart from this we would be happy to have one more option/flag to choose enable/disable creating
test-cluster-follower-headless
test-cluster-follower
services.

We might not want to create services for follower for example we might not want to create test-cluster-follower-headless, test-cluster-follower .

Thanks,
Arpan

[shubham-cmyk]

@arpan57
would you like to raise a PR on this