br: create database by db pool

[Leavrth]

What problem does this PR solve?

Issue Number: close #50767

Problem Summary:
br restore is very slowly if there are many databases(2000+)

What changed and how does it work?

create database by db pool

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

40 minutes -> 5 minutes

• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @Leavrth. Thanks for your PR.

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[codecov]

Codecov Report

Merging #50771 (f123984) into master (761b404) will increase coverage by 5.6708%.
Report is 90 commits behind head on master.
The diff coverage is 52.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50771        +/-   ##
================================================
+ Coverage   70.3318%   76.0027%   +5.6708%     
================================================
  Files          1456       1465         +9     
  Lines        420913     439267     +18354     
================================================
+ Hits         296036     333855     +37819     
+ Misses       104509      85194     -19315     
+ Partials      20368      20218       -150     

Flag	Coverage Δ
integration	48.9781% <52.0000%> (?)
unit	70.3076% <52.0000%> (+<0.0001%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	57.0589% <52.0000%> (+6.5154%)	⬆️

[3pointer]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, YuJuncen

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-05 09:14:35.98905125 +0000 UTC m=+175401.555821127: ☑️ agreed by 3pointer.
• 2024-02-07 02:36:03.993149034 +0000 UTC m=+324289.559918926: ☑️ agreed by YuJuncen.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #51026.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #51027.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #51028.