refactor(BA-5861): Share a single DockerStatsStreamer across CPU/Memory plugins#11234

rapsealk wants to merge 5 commits into

perf/11219-stream-container-statslablup/backend.ai:perf/11219-stream-container-statsfrom

perf/11232-shared-statsstreamerlablup/backend.ai:perf/11232-shared-statsstreamerCopy head branch name to clipboard