Tracking issue for Optimize DM task lifecycle management and dmctl commands

[WizardXiao]

Is your feature request related to a problem?

This is a tracking issue for Optimize task lifecycle management and all command formats of dmctl.

Optimize commands

• [ ] #5900
• [ ] Optimize source commands
• [ ] Optimize relay commands
• [ ] Optimize ddl-lock commands
• [ ] Optimize member commands

[GMHDBJD]

If any interface is changed, please notify me or change it for engine also...

[WizardXiao]

ok