Draft: demo for csi-lib metrics feature

[7ing]

This PR demonstrates csi-lib metrics feature in
cert-manager/csi-lib#73

[cert-manager-prow]

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[cert-manager-prow]

Hi @7ing. 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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