[Feature] Can DDC Support HPA

[wdxxl]

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Description

For more reason like DDC reduce cost, if computeGroups or others can support HPA, it will reduce more cost during the none-peak hours.

not sure why autoScalingPolicy not support in DDC.

https://github.com/apache/doris-operator/blob/master/doc/examples/doriscluster-sample-cn-autoscaler.yaml#L46-L59

Use case

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Related issues

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[intelligentfu8]

This is not a plan to support now, because be always have to cache data, so it is a state service. tablet migration will reduce the query efficiency.