Tracking: hummock compaction group

[zwang28]

static compaction group

• static compaction group: state and MV. feat(meta): initiate static compaction groups #2952
• compaction group service/client. feat(meta): add compaction group service/client #3061
• register operator to compaction group. feat(meta): register/unregister table fragments to compaction group #3044
• write path with compaction group.
• read path with compaction group.
• Impact of (more) static compaction groups. It should increase compaction concurrency. But it also causes more shared buffer IO and SSTs.

dynamic compaction group

• compaction group management: add/remove groups.
• specify compaction group for states.
• merge/split

[zwang28]

Reopen when again work on it.