Add metricdescs subcommand for ListMetricDescriptors API #1815
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What type of PR is this?
/kind feature
What this PR does / why we need it:
There's no subcommand for ListMetricDescriptors https://github.com/kubernetes/cri-api/blob/c9a9c280d8500241d4e0ca04c28fa19974147108/pkg/apis/runtime/v1/api.proto#L130 .
When CRI can return metrics, this feature would be useful to know what kind of metrics can be retrieved via CRI.
I'm open to changing the subcommand name.
Server implementations:
Which issue(s) this PR fixes:
Special notes for your reviewer:
Does this PR introduce a user-facing change?