fix: refactor serializing int type to buffer

[zhagnlu]

#33067

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[mergify]

@zhagnlu E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[zhagnlu]

/run-cpu-e2e

[codecov]

Codecov Report

Attention: Patch coverage is 79.31034% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 82.21%. Comparing base (40e5c0b) to head (f3ce918).
Report is 129 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #33068      +/-   ##
==========================================
+ Coverage   82.06%   82.21%   +0.15%     
==========================================
  Files        1005      996       -9     
  Lines      127648   128395     +747     
==========================================
+ Hits       104748   105556     +808     
+ Misses      18923    18869      -54     
+ Partials     3977     3970       -7     

Files	Coverage Δ
internal/core/src/index/ScalarIndexSort.cpp	74.26% <100.00%> (-0.17%)	⬇️
internal/core/src/storage/Util.cpp	80.68% <100.00%> (-0.57%)	⬇️
internal/core/src/storage/BinlogReader.h	91.66% <87.50%> (-8.34%)	⬇️
internal/core/src/common/Utils.h	90.26% <71.42%> (+1.96%)	⬆️
internal/core/src/storage/Event.cpp	80.97% <77.50%> (-0.43%)	⬇️

... and 238 files with indirect coverage changes

[longjiquan]

/lgtm