ddl, parser, executor, ddl worker and reorganization worker: admin pause/resume ddl jobs

[dhysum]

What problem does this PR solve?
Issue Number: close #18015 #40041

Related issue number: #39751 #43061

Problem Summary:

• admin pause ddl jobs 3,5;
• admin resume ddl jobs 3,5;

pause an running DDL; and resume the paused DDL.

What is changed and how it works?

Once received the admin pause request, it will mark the Job as pausing, then the background worker will turn the DDL job to be paused and mark it as not processing. While, the admin resume is the contrary way.

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

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[ti-chi-bot]

PR needs rebase.

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[ti-chi-bot]

Hi @dhysum. Thanks for your PR.

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[ti-chi-bot]

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[dhysum]

Wrong taget branch