optimize system snapshot

[zpf121]

optimize system snapshot

origin:
checkpoint --> create snapshot

now:
create snapshot

[codecov]

Codecov Report

❌ Patch coverage is 59.06615% with 526 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.78%. Comparing base (888bbc8) to head (6ea581b).

Files with missing lines	Patch %	Lines
src/parser/search_parser.cpp	57.51%	131 Missing and 81 partials ⚠️
src/storage/new_txn/new_txn_impl.cpp	60.09%	140 Missing and 30 partials ⚠️
src/storage/wal/wal_entry_impl.cpp	37.34%	48 Missing and 4 partials ⚠️
src/parser/search_parser.h	55.33%	29 Missing and 17 partials ⚠️
src/storage/common/snapshot_info_impl.cpp	63.01%	19 Missing and 8 partials ⚠️
src/executor/operator/physical_command_impl.cpp	42.85%	2 Missing and 2 partials ⚠️
...xecutor/operator/snapshot/system_snapshot_impl.cpp	69.23%	2 Missing and 2 partials ⚠️
src/parser/expression_parser.h	63.63%	2 Missing and 2 partials ⚠️
src/storage/new_txn/base_txn_store_impl.cpp	91.17%	3 Missing ⚠️
src/parser/parser.h	81.81%	0 Missing and 2 partials ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3109      +/-   ##
==========================================
+ Coverage   46.70%   46.78%   +0.08%     
==========================================
  Files         724      725       +1     
  Lines      150823   151598     +775     
  Branches    27446    27574     +128     
==========================================
+ Hits        70443    70929     +486     
- Misses      70713    70967     +254     
- Partials     9667     9702      +35     

Flag	Coverage Δ
debug http test	27.30% <25.75%> (-0.45%)	⬇️
debug parallel test	17.60% <16.34%> (-0.10%)	⬇️
debug pysdk test	29.40% <25.21%> (-0.18%)	⬇️
debug sqllogical test	31.78% <19.92%> (-0.10%)	⬇️
debug unit test	32.03% <53.30%> (+0.16%)	⬆️

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