split the meta_function_level functions are replica clearing and replica balancing

## Feature Request

**Is your feature request related to a problem? Please describe:**
When the disk capacity of the backend node of the cluster is insufficient, we first drop useless tables, but at this time, we do not dare to turn on the cluster load balancing function to automatically clean gar replicas, because we are worry about that the disk space will be filled up by the subsequent load balancing operation.

**Describe the feature you'd like:**
We want to be able to separate replica gar clearing and cluster replica load balancing from meta_lively function.