Default annotations

[ahmedwaleedmalik]

User Story
As a KubeLB admin, I'd like to configure default annotations for my resources such as services, ingresses, and Gateway API CRs. This is helpful in assigning default configurations to resources that are internal and you might not want to expose them to the end users.

For example, to create load balancers on Hetzner you need load-balancer.hetzner.cloud/location specified on the service of type LoadBalancer. Having this as a default annotation, configured globally or per tenant could remove this requirement while keeping the location as something internal to the management cluster.