Add ability to expose metrics in non leader pods

[lilic]

Feature Request

Is your feature request related to a problem? Please describe.
Metrics serving is being started only when we call the Start() in controller-runtime, we lock any non leaders with a lock before we call the Start() in the generated operators. Due to this the metrics are only being served for non leader pods.

Describe the solution you'd like
We have two possible solutions:

1. Serve the metrics independently of controller-runtime, this requires us disabling serving of metrics altogether in controller-runtime.
2. Add new feature in controller-runtime to start serving metric independently of starting the manager.

See #786 (comment) for full background.

[lilic]

Opened PR -> kubernetes-sigs/controller-runtime#337

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[lilic]

/remove-lifecycle stale

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@openshift-bot: Closing this issue.

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