Dual-Stack (IPv4 and IPV6) Support

Initial implementation of the controller is purely focused on IPv4 support. Research if dual-stack support is needed and implement that.

Dual stack networking is coming to K8s soon:
`(alpha: "v1.20"/beta: "v1.21"/stable: "v1.23")`

See
https://github.com/kubernetes/enhancements/tree/master/keps/sig-network/563-dual-stack