[EKS] [Automated Backup and Restore]: provide automated backups and ability to restore on to a new cluster

**Tell us about your request**
I would like to be able to enable backups on a customizable schedule for Kubernetes clusters running on EKS. Ideally I would be able to specify what I would like to be included in the backups (eg include certain namespaces and resources, exclude resources with a given label). I should be able to use these backups to restore to an entirely new EKS cluster as part of a failover or migration.

**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?**
Sometimes I want to make high risk cluster-wide changes to a cluster running on EKS. For example, I may want to roll out new Network Policies, RBAC settings, or change my CNI plugin. All of these are high risk procedures. Ideally, I want to bring up a new cluster with these changes already on it, and verify that they are working before failing over to it from a cluster that is currently serving production traffic. In this scenario, if there are issues, I can easily revert the production traffic back to the original cluster without these changes on it. If I perform these kinds of operations in place on a production cluster, I risk downtime if they don't work as expected.

**Are you currently working around this issue?**
I'm currently leveraging Heptio Velero (https://github.com/heptio/velero) to take fine-tuned backups of clusters. Using these backups, I am able to cutover to entirely new clusters by performing a restore and redirecting traffic. This is a fairly manual process and I need to manage Heptio Velero and the AWS resources it requires. It would be nice if this was all built in to EKS itself.

**Additional context**
N/A