Automatic merge from submit-queue
Implement API usage metrics for gce storage
**What this PR does / why we need it**:
This PR implements support for emitting metrics from GCE about storage operations.
**Which issue this PR fixes**
Fixes https://github.com/kubernetes/features/issues/182
**Release note**:
```
Add support for emitting metrics from GCE cloudprovider about storage operations.
```