[Feature] Can DDC Support HPA

### Search before asking

- [x] I had searched in the [issues](https://github.com/apache/doris-operator/issues?q=is%3Aissue) and found no similar issues.

### 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

_No response_

### Related issues

_No response_

### Are you willing to submit PR?

- [ ] Yes I am willing to submit a PR!

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