[Features]Kb support mutil-cluster

[CharlesQQ]

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For now, we have a database service that we want to containerize using kubeblocks, such as an etcd cluster. We need to deploy three instances in three K8S clusters(member cluster) for high availability between clusters.

We already have components that support multi-cluster, such as karmada. Now we want kubeblocks to be able to leverage the capabilities of karmada and integrate with it to achieve the above functions.

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But now, according to our research results, it is not enough to use karmada to distribute instanceSet to member clusters only; because lifecycleActions need to cooperate with component controller to complete, which means that component also needs to be distributed to member cluster; this is only the problem known at present, whether there will be other unknown problems, it is not clear

Here is the actual situation of Kuaishou, only instanceSet is distributed; refer to https://mp.weixin.qq.com/s/YKFxgL5oCTHfD05Dg7Ju8w?scene=1

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kubeblocks supports deploying a cluster instance on multiple clusters; no matter which method is used

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