[EKS] [request]: Support VPA in EKS add-ons

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**Tell us about your request**
Support VPA in EKS add-ons

**Which service(s) is this request for?**
EKS

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
GKE has a feature of `Enable Vertical Pod Autoscaling` for exiting clusters or during cluster creation. So, similar feature would be helpful with EKS and if we can consider the same with EKS add-ons

**Are you currently working around this issue?**
Currently the VPA is manually deployed per https://docs.aws.amazon.com/eks/latest/userguide/vertical-pod-autoscaler.html

**Attachments**
If you think you might have additional information that you'd like to include via an attachment, please do - we'll take a look. (Remember to remove any personally-identifiable information.)

No files, tests, or code entry points are named. Start with the linked AWS EKS Vertical Pod Autoscaler documentation and determine the required EKS add-on scope; done means VPA is supported for EKS add-ons rather than manually deployed.

Written by the indexing model from the issue text.