Add annotation for external-dns services, ingress configuration so only creates resources with it

[jorgemoralespou]

Is your feature request related to a problem? Please describe.

Currently we are monitoring all services (and previously ingresses and httpproxies). We currently only set up a wildcard dns for envoy service.
There's no way, other than altering the envoy service to create a DNS entry at will.

Describe the solution you'd like

It'll be nice if we could monitor back ingresses and configure external dns with an annotation (like they do in this issue so that if we want, we could deploy an ingress that would create a CNAME on the DNS. This way, we can automate load balancing of lookup clusters via a CNAME that is automated by deploying a resource on the cluster.

Describe alternatives you've considered

No response

Additional information

No response