Refine codes of datanode buffer (#23168)
This PR refines deltabuffer of datanode:
- Add last sync time for compacted segment, see also: #23210
- Ensure all deltabuffermanager handles all delete related operations
- Change usedMemory to atomic.Int64
- Remove allocator in delete buffer
Signed-off-by: Nyangxuan <xuan.yang@zilliz.com>
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