br: move ScatterRegions into split package

[lance6716]

What problem does this PR solve?

Issue Number: ref #51533

Problem Summary:

What changed and how does it work?

So later lightning can reuse it

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 @lance6716. Thanks for your PR.

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[codecov]

Codecov Report

Merging #51614 (7b3a796) into master (7be9a1e) will increase coverage by 1.9701%.
The diff coverage is 57.3529%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #51614        +/-   ##
================================================
+ Coverage   70.6970%   72.6672%   +1.9701%     
================================================
  Files          1472       1472                
  Lines        437001     437033        +32     
================================================
+ Hits         308947     317580      +8633     
+ Misses       108666      99395      -9271     
- Partials      19388      20058       +670     

Flag	Coverage Δ
integration	48.2082% <17.6470%> (?)
unit	70.4575% <55.8823%> (-0.0365%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	51.1577% <57.3529%> (+5.2986%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, Leavrth

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-11 03:02:59.863725045 +0000 UTC m=+654606.885971434: ☑️ agreed by Leavrth.
• 2024-03-11 03:24:55.709314208 +0000 UTC m=+655922.731560597: ☑️ agreed by D3Hunter.

[lance6716]

/retest

[tiprow]

@lance6716: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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