Add Prometheus metrics endpoint about cert-manager HOT 7 CLOSED

#73 has added the beginnings of a prometheus endpoint. It currently just exposes the standard prometheus metrics so will need extending to add custom metrics.

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Is the idea to have a metric for each certificate? It'd be great to have a way of finding out a total of certificates, and a total number of certificates that are having errors being issued/renewed.

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A note to remember when adding the metrics to the helm chart to add a 'headless' Service (clusterIP: none) for metrics discovery. And it should allow both custom annotations and custom labels (old pre-CRD prometheus used scrape annotations, prometheus-operator uses label selectors from the ServiceMonitor CRD).

You see people add metrics as an extra port on the application's Service load balancer. But load balancing your metrics collection usually makes no sense, since you want the metrics from all replicas/endpoints, not just a random one.

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it would be super awesome to get this rls'd.....

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really looking forward to this, right now i only manage to monitor expiration date from external with blackbox exporter but this would be a great addition

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