Provide an interface to halt all scheduler and checking #6493
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Description
Development Task
In some special situations, suspending all scheduling is a very helpful behavior, such as before performing Flashback on the TiKV cluster, so it is best to provide an interface to do this. It should be noted that the suspension of scheduling here is best able to remember and restore the old configuration, rather than simply deleting all schedulers and checkers in a crude manner.
Activity