br: merge range in lightweight when snapshot restore (#50648)

[ti-chi-bot]

This is an automated cherry-pick of #50648

What problem does this PR solve?

Issue Number: close #50613

Problem Summary:
Merge file ranges takes too much time when the file ranges's size is much large.

What changed and how does it work?

use the O(n) algorithm

Check List

Tests

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

[Leavrth]

/test pull-br-integration-test

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/test pull-br-integration-test

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[Leavrth]

/test pull-br-integration-test

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[Leavrth]

/test unit-test

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/test unit-test

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.5@40f51ca). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-7.5     #50946   +/-   ##
================================================
  Coverage               ?   71.9885%           
================================================
  Files                  ?       1403           
  Lines                  ?     406823           
  Branches               ?          0           
================================================
  Hits                   ?     292866           
  Misses                 ?      94255           
  Partials               ?      19702           

Flag	Coverage Δ
unit	71.9885% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	53.9913% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.2598% <0.0000%> (?)

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,Leavrth]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-04 06:06:11.183117357 +0000 UTC m=+77696.749887231: ☑️ agreed by 3pointer.
• 2024-02-04 07:14:47.114286966 +0000 UTC m=+81812.681056842: ☑️ agreed by Leavrth.