Should support scatter speed limit
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type/feature-request
- Dominant language
- Go
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Description
## Feature Request
### Describe your feature request related problem
During fast DDL, many empty regions will be split and then scattered to different tikvs.

However, it will slow down the tikv raftstore, leading to a duration spike as follows.

It would make the cluster more stable if we could limit the scatter speed.
### Describe the feature you'd like
### Describe alternatives you've considered
### Teachability, Documentation, Adoption, Migration Strategy
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