lightning: allow configure the desired size and number of rows of each INSERT statement for logical mode (#46997)

[ti-chi-bot]

This is an automated cherry-pick of #46997

What problem does this PR solve?

Issue Number: close #46607

Problem Summary:

What is changed and how it works?

Added a config values tikv-importer.logical-import-batch-{size,rows} which controls how big the INSERT statement would be when using logical mode.

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.

In Lightning logical mode, the length of the INSERT statements executed downstream can now be changed from the default 1.0 MiB. Decreasing this allows reducing performance impact caused by large transaction.

[ti-chi-bot]

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[ti-chi-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 53.84615% with 12 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release-7.5@12c763f). Click here to learn what that means.

Additional details and impacted files

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Flag	Coverage Δ
unit	71.9897% <53.8461%> (?)

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Components	Coverage Δ
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parser	∅ <0.0000%> (?)
br	53.4018% <0.0000%> (?)