secretgen-controller should allow configuration of the metrics server port

[douglas-c]

Describe the problem/challenge you have
Running secretgen-controller in a deployment with hostNetwork=true can lead to the default metrics server port 8080 conflicting with other applications running on that node.

Describe the solution you'd like
We would like the metrics server port to be configurable, at least via container args if not through something more formal like a ConfigMap.

Anything else you would like to add
There was an identical issue with kapp-controller, see kapp-controller/issues/394 which was fixed with kapp-controller/pull/404. A similar fix would work for our use case as well.

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