[Feature]: Autoscaler for OceanBase

Describe your use case

Configure a Horizontal Cluster Autoscaler to watch resource utilization of specific cluster or tenant. If the utilization rate keep high or low enough, the autoscaler scales up or down the cluster or tenant.

Describe the solution you'd like

Maybe a new CRD named HorizontalAutoscaler could be created to handle such a use case. The draft spec can be like:

spec:
  clusterName:
  tenantName: 
  targetCPUUtilization: 
  targetMemoryUtilization: 
  maxZones: 
  minZones:
  maxServers: 
  minServers:
  maxUnits: 
  minUnits:
  maxUnitConfig: 
  minUnitConfig:

Describe alternatives you've considered

No response

Additional context

No response