Automatic merge from submit-queue (batch tested with PRs 64481, 64569). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Instrument envelop transformer.

**What this PR does / why we need it**:
Add metrics for envelope transformer: 
   transformation_operation_count
   transformation_failures_count
   envelope_transformation_cache_misses_count
   data_key_generation_latencies_microseconds
   data_key_generation_failures_count

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```