this pr
1. picked #35630, which was reverted #36098 before.
2. picked #36344 from master
these two pr fixed existing bug about auto partition load.
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Co-authored-by: Kaijie Chen <ckj@apache.org>
## Proposed changes
Change `use_cnt` mechanism for incremental (auto partition) channels and
streams, it's now dynamically counted.
Use `close_wait()` of regular partitions as a synchronize point to make
sure all sinks are in close phase before closing any incremental (auto
partition) channels and streams.
Add dummy (fake) partition and tablet if there is no regular partition
in the auto partition table.
Backport #35287
Co-authored-by: zhaochangle <zhaochangle@selectdb.com>
