domain: splite handleDDLEvent into new thread (#53734)

[ti-chi-bot]

This is an automated cherry-pick of #53734

What problem does this PR solve?

Issue Number: ref #53744

Problem Summary:

What changed and how does it work?

Now, handleDDlEvent is put into the goroutine which also handles gcstats and other works. so it cannot handle ddl event as soon as possible. it will lead to the problem. for example, If we cannot handle the CreateTable event promptly, this table hasn't the stats.

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

[hawkingrei]

/retest

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, winoros

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-27 06:55:42.219102445 +0000 UTC m=+853337.353552566: ☑️ agreed by hawkingrei.
• 2024-08-27 10:00:43.91056289 +0000 UTC m=+864439.045013010: ☑️ agreed by winoros.

[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.1@b0823fa). Learn more about missing BASE report.

Additional details and impacted files

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