Flush log store meta when compacting log

[yuwmao]

In baseline resync scenario, log truncation won't flush the truncate result immediately(periodically flushed by resource manager), thus if durable_commit_lsn has been flushed but start_lsn of the logstore hasn't been flushed, it will trigger the issue6.
Add a flush meta function in logstore, and manually trigger flush in log truncation.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 66.10%. Comparing base (1a0cef8) to head (dbb30c0).
Report is 125 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/lib/replication/repl_dev/raft_state_machine.cpp	0.00%	2 Missing ⚠️
src/lib/replication/repl_dev/raft_repl_dev.cpp	0.00%	1 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #633      +/-   ##
==========================================
+ Coverage   56.51%   66.10%   +9.58%     
==========================================
  Files         108      109       +1     
  Lines       10300    10986     +686     
  Branches     1402     1505     +103     
==========================================
+ Hits         5821     7262    +1441     
+ Misses       3894     3005     -889     
- Partials      585      719     +134     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[JacksonYao287]

LGTM. only a minor comment

[JacksonYao287]

LGTM