[Features] support heterogeneous component configuration for ClusterSpec.Shardings API #8443
Description
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Scenario one, takes the specified pod instance offline, and the offline instance should be recorded in the component configuration of the corresponding shard.
Scenario two, horizontal scale up some instances for a shard due to traffic imbalance
Scenario three, vertical scale up some instances for a shard due to traffic imbalance
Scenario four, instance replacement requires scaling up before scaling down.
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