ISSUE-1470: remove common/allocators

[BohuTANG]

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Summary

• Remove common/allocators

Changelog

• Improvement

Related Issues

Fixes #1470

Test Plan

Unit Tests

Stateless Tests

[databend-bot]

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[databend-bot]

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[codecov-commenter]

Codecov Report

Merging #1472 (13f7cb8) into master (e89478e) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1472   +/-   ##
======================================
  Coverage      73%     73%           
======================================
  Files         498     498           
  Lines       29481   29481           
======================================
  Hits        21586   21586           
  Misses       7895    7895           

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[zhang2014]

LGTM

[databend-bot]

CI Passed
Reviewer Approved
Let's Merge