enhance: improve bloomfilter performance

[xiaofan-luan]

1. remove unnecessary allocations
2. recude the concurrency to avoid extra context switch

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.39%. Comparing base (1f14053) to head (ecc3604).
Report is 5 commits behind head on master.

❗ Current head ecc3604 differs from pull request most recent head e5fc472

Please upload reports for the commit e5fc472 to get more accurate results.

❌ Your project check has failed because the head coverage (69.39%) is below the target coverage (77.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #39730   +/-   ##
=======================================
  Coverage   69.39%   69.39%           
=======================================
  Files         302      302           
  Lines       27077    27077           
=======================================
  Hits        18790    18790           
  Misses       8287     8287           

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	69.39% <ø> (ø)
Go	∅ <ø> (∅)