statistics: batch insert topn and bucket when saving table stats (#35326)

[ti-srebot]

cherry-pick #35326 to release-5.0
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# In tidb repo:
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---

What problem does this PR solve?

Issue Number: ref #35142

Problem Summary:

Analyze partition table is slower than analyze non-partition table with the same amount of data.

What is changed and how it works?

In SaveTableStatsToStorage, we execute one insert statement for each topn and each bucket so there are too many insertions in the transaction and make the function time-consuming. The PR batches insertions for topn and bucket and make SaveTableStatsToStorage more efficient.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  For a table with 40 million rows and 20 partitions, analyze takes 9min and SaveTableStatsToStorage for one partition takes 21s. After the PR, analyze takes 3min and SaveTableStatsToStorage for one partition takes 4s.
• 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

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[ti-chi-bot]

@ti-srebot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-srebot]

/run-all-tests

[ti-srebot]

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[VelocityLight]

This pull request is closed because it's related version has closed automatic cherry-picking.
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