Add process and go runtime metrics for controller

[mindw]

Pull Request Motivation

These metrics are default when using Prometheus go client's pre-defined registry, but were missing as the controller creates it's own registry.

Useful many debug scenarios

Kind

feature

Release Note

Add process and go runtime metrics for controller

[cert-manager-prow]

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[cert-manager-prow]

Hi @mindw. Thanks for your PR.

I'm waiting for a cert-manager member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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