Homeobject side graceful shutdown

[JacksonYao287]

this PR add counters to record the pending request and start shutdown homestore when no pending request

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 34.95146% with 67 lines in your changes missing coverage. Please review.

Project coverage is 61.03%. Comparing base (1746bcc) to head (023a31c).
Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/homestore_backend/hs_shard_manager.cpp	20.00%	28 Missing and 4 partials ⚠️
src/lib/homestore_backend/hs_blob_manager.cpp	26.47%	22 Missing and 3 partials ⚠️
src/lib/homestore_backend/hs_pg_manager.cpp	53.33%	5 Missing and 2 partials ⚠️
src/lib/homestore_backend/hs_homeobject.cpp	57.14%	2 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
- Coverage   63.15%   61.03%   -2.13%     
==========================================
  Files          32       33       +1     
  Lines        1900     2564     +664     
  Branches      204      300      +96     
==========================================
+ Hits         1200     1565     +365     
- Misses        600      838     +238     
- Partials      100      161      +61     

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[xiaoxichen]

baseline resync be considered as HS or HO?

[JacksonYao287]

it will be considered as HS.

Homeobject side graceful shutdown will only make sure that when shutting down homeobject , there is no pending external (or user api) calls from upper layer and reject later api calls .

baseline resync is a mechanism of statemachin(raft), and all the baseline resync related code in homeobject is called by statemachine. homeobject can not do anything for this. so , we need to handle this in raft level (homestore).

i will try to submit another pr for homestore graceful shutdown.

[JacksonYao287]

https://docs.google.com/document/d/11SP84tI9AwB_FhRSFJoC8oZIHECOn4o2mbooZf4W0EY/edit?tab=t.0#heading=h.gitenqkosfz6

related doc