Implementation of follower-side snapshot transmission resumption

[koujl]

• Introduced a new snp_rcvr_meta_blk to record snapshot receiving progress on the follower. Since the ReplicationStateMachine instance cannot be directly referenced, the superblock is added to the HS_PG struct to act as a broker.
• Enabled the follower to request resumption from the beginning of a specific shard in write_snapshot_obj. Adjusted the cursor update handling logic to accommodate this scenario.
• Added a new test case for restarting the follower with a shorter delay to test resumption without causing a leader timeout.

[codecov-commenter]

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

Codecov Report

Attention: Patch coverage is 38.63636% with 54 lines in your changes missing coverage. Please review.

Project coverage is 63.18%. Comparing base (1746bcc) to head (dd1726c).
Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
...lib/homestore_backend/snapshot_receive_handler.cpp	37.50%	35 Missing ⚠️
...ib/homestore_backend/replication_state_machine.cpp	0.00%	13 Missing ⚠️
src/lib/homestore_backend/pg_blob_iterator.cpp	63.63%	0 Missing and 4 partials ⚠️
src/lib/homestore_backend/hs_homeobject.cpp	75.00%	1 Missing ⚠️
src/lib/homestore_backend/hs_homeobject.hpp	0.00%	1 Missing ⚠️

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

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #255      +/-   ##
==========================================
+ Coverage   63.15%   63.18%   +0.02%     
==========================================
  Files          32       33       +1     
  Lines        1900     2537     +637     
  Branches      204      299      +95     
==========================================
+ Hits         1200     1603     +403     
- Misses        600      771     +171     
- Partials      100      163      +63     

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

[zhiteng]

The PR description should be in the commit message as well to reserve the context the change.