stats: optimize build topn and histogram (#63285)

[ti-chi-bot]

This is an automated cherry-pick of #63285

What problem does this PR solve?

Issue Number: close #63286

Problem Summary:

What changed and how does it work?

1. Use heap to maintain the topN to reduce memory shuffle
2. Track topN index range while iterating samples
3. When building histogram, skip entries that falls into the topN range so don't need to remove topN values from samples.

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

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

@Tristan1900 This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

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[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	4bf9f74	link	true	/test build
idc-jenkins-ci-tidb/check_dev	4bf9f74	link	true	/test check-dev
idc-jenkins-ci-tidb/check_dev_2	4bf9f74	link	true	/test check-dev2
idc-jenkins-ci-tidb/unit-test	4bf9f74	link	true	/test unit-test
idc-jenkins-ci-tidb/mysql-test	4bf9f74	link	true	/test mysql-test

Full PR test history. Your PR dashboard.

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