Provide a way to dynamic disable region split
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good first issue
help wanted
type/enhancement
- Dominant language
- Go
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Description
## Development Task
In some recovery scenes, some unhealthy regions may split and make the cluster more difficult to recover. we need an easy way to disable the region split. the easy way is to disable the ID allocator, [details](https://github.com/tikv/pd/blob/master/server/grpc_service.go#L558-L583).
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