Automatic merge from submit-queue (batch tested with PRs 50555, 51152). 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>.

Implement CRI stats in Docker Shim

**What this PR does / why we need it**:
This PR implements CRI Stats in the Docker Shim. It is needed to enable CRI stats for Docker and ongoing /stats/summary API changes in moving to use CRI.

Related issues:
#46984 (CRI: instruct kubelet to (optionally) consume container stats from CRI)
#45614 (CRI: add methods for container stats) 

This PR is also a followup to my original PR (https://github.com/kubernetes/kubernetes/pull/50396) to implement Windows Container Stats. The plan is that Windows Stats will use a hybrid model: pod and container level stats will come from CRI (via dockershim) and that node level stats will come from a "winstats" package that exports cadvisor like datastructures using windows specific perf counters from the node. I will update that PR to only export node level stats. 

@yujuhong @yguo0905 @dchen1107 @jdumars @anhowe @michmike

**Special notes for your reviewer**:

**Release note**:

```release-note
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