br: merge range in lightweight when snapshot restore

[Leavrth]

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

[tiprow]

Hi @Leavrth. Thanks for your PR.

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[codecov]

Codecov Report

Merging #50648 (0af9381) into master (1db1587) will decrease coverage by 1.2567%.
Report is 102 commits behind head on master.
The diff coverage is 22.2222%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50648        +/-   ##
================================================
- Coverage   72.1179%   70.8612%   -1.2567%     
================================================
  Files          1454       1463         +9     
  Lines        347571     437040     +89469     
================================================
+ Hits         250661     309692     +59031     
- Misses        76542     106543     +30001     
- Partials      20368      20805       +437     

Flag	Coverage Δ
integration	48.8914% <22.2222%> (?)

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

Components	Coverage Δ
dumpling	56.3129% <ø> (ø)
parser	∅ <ø> (∅)
br	52.6591% <22.2222%> (+0.4787%)	⬆️

[Leavrth]

directly move from br/pkg/restore/merge.go

[3pointer]

rest LGTM

[YuJuncen]

rest 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:

• 2024-02-01 06:05:17.493430662 +0000 UTC m=+1631959.057728357: ☑️ agreed by 3pointer.
• 2024-02-02 10:13:47.980124913 +0000 UTC m=+1733269.544422617: ☑️ agreed by YuJuncen.

[BornChanger]

/type cherry-pick-for-release-7.5

[BornChanger]

/type cherry-pick-for-release-6.5

[BornChanger]

/type cherry-pick-for-release-7.1

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #50944.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #50945.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #50946.