store/copr: add a param "limit" to region cache's SplitRegionRanges (#40411)

[ti-chi-bot]

This is an automated cherry-pick of #40411

What problem does this PR solve?

Issue Number: close #38436

Problem Summary: See #38436 (comment)

What is changed and how it works?

Add a parameter "limit" to regionCache.SplitRegionRanges().

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

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

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• wjhuang2016
• zimulala

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[zimulala]

LGTM

[tangenta]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 9f1e7ee

[hawkingrei]

/retest