Feature: Support scaling Kubernetes native Horizontal Pod Autoscaler (HPA) with cron.

[jwcesign]

What would you like to be added: I want Karmada support to modify the min/max of HPA in advance and cope with sudden traffic peaks.

Why is this needed: There is the following scenario: Users use PP to deploy native K8s HPA to member clusters, allowing member clusters to use HPA for auto-scaling. However, there is a certain delay in the effectiveness of HPA, which cannot respond to sudden peak traffic. Therefore, it is necessary to regularly adjust the min/max of HPA in advance to cope with sudden peak traffic. Therefore, I want Karmada support to modify the min/max of HPA in advance and cope with sudden traffic peaks.

Tasks:

• [ ] Code implementation
• [ ] e2e testing
• [ ] docs

[chaunceyjiang]

Users use PP to deploy native K8s HPA to member clusters, allowing member clusters to use HPA for auto-scaling.

Since users are using the native HPA, I believe we should recommend them to use some well-known CronHPA in the k8s ecosystem, rather than having Karmada implement it again.