flatbuffer for baseline resync

[yamingk]

1. define flatbuffer structure for pg/shard creation during base line resync
2. define blob data flatbuffer structure during blob data resync
3. add a mock api to pick up homestore 6.3

[xiaoxichen]

lgtm

[xiaoxichen]

as we agree to add created_lsn on shard, do we want to sync this ?
or actually setting the created_lsn to snapshot_lsn is also right, just sort of inconsistency we need to aware when we doing the scrubber.

[yamingk]

there should be no harm adding that, let me add it.

[sanebay]

native_include "sisl/utility/non_null_ptr.hpp";
this is needed on both .fbs files to compile with c++.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.24%. Comparing base (acb04e8) to head (255e3a5).
Report is 12 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #170      +/-   ##
==========================================
+ Coverage   68.69%   70.24%   +1.55%     
==========================================
  Files          30       30              
  Lines        1581     1536      -45     
  Branches      163      160       -3     
==========================================
- Hits         1086     1079       -7     
+ Misses        408      369      -39     
- Partials       87       88       +1     

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