Add extra columns for EventListeners

[dibyom]

Changes

Adds the address.url and the Available status as additional columns, so users
running kubectl get can access them easily.

NAME                     ADDRESS                                                           AVAILABLE   REASON
gitlab-listener          http://el-gitlab-listener.default.svc.cluster.local:8080          True        MinimumReplicasAvailable
listener-embed-binding   http://el-listener-embed-binding.default.svc.cluster.local:8080   True        MinimumReplicasAvailable

Thanks to @n3wscott for the suggestion!!

/kind feature

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• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
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Release Notes

EventListeners now display the status.address.url  and Available status.Condition as additional fields when listed with kubectl get

[wlynch]

/lgtm
/approve

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[n3wscott]

Nicccce!!!