Merge pull request #50932 from yguo0905/stats-cadvisor

Automatic merge from submit-queue (batch tested with PRs 50932, 49610, 51312, 51415, 50705)

Implement StatsProvider interface using cadvisor

Ref: https://github.com/kubernetes/kubernetes/issues/46984

- This PR changes the `StatsProvider` interface in `pkg/kubelet/server/stats` so that it can provide container stats from either cadvisor or CRI, and the summary API can consume the stats without knowing how they are provided.
- The `StatsProvider` struct in the newly added package `pkg/kubelet/stats` implements part of the `StatsProvider` interface in `pkg/kubelet/server/stats`.
- In `pkg/kubelet/stats`,
    - `stats_provider.go`: implements the node level stats and provides the entry point for this package.
    - `cadvisor_stats_provider.go`: implements the container level stats using cadvisor.
    - `cri_stats_provider.go`: implements the container level stats using CRI.
    - `helper.go`: utility functions shared by the above three components.
- There should be no user visible behaviors change in this PR.
- A follow up PR will implement the StatsProvider interface using CRI.

**Release note**:
```
None
```

/assign @yujuhong 
/assign @WIZARD-CXY

pkg/kubelet/runonce_test.go

@@ -113,7 +113,7 @@ func TestRunOnce(t *testing.T) {
 	kb.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", nettest.NewFakeHost(nil), kubeletconfig.HairpinNone, "", network.UseDefaultMTU)
 	// TODO: Factor out "StatsProvider" from Kubelet so we don't have a cyclic dependency
 	volumeStatsAggPeriod := time.Second * 10
-	kb.resourceAnalyzer = stats.NewResourceAnalyzer(kb, volumeStatsAggPeriod, kb.containerRuntime)
+	kb.resourceAnalyzer = stats.NewResourceAnalyzer(kb, volumeStatsAggPeriod)
 	nodeRef := &v1.ObjectReference{
 		Kind:      "Node",
 		Name:      string(kb.nodeName),