[EKS] [aws-ebs-csi-driver][CloudWatch Observability]: Ingest Storage Metrics

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**Tell us about your request**
Ingest metrics exposed by aws-ebs-csi-driver into CloudWatch.

**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?**
I have provisioned an EKS Cluster (EC2-backed) with EBS csi driver, CloudWatch addons enabled.
What bothers me is that I don't seem to be getting metrics such as kubelet_volume_stats_available_bytes into CloudWatch (Container Insights have been enabled)

**Are you currently working around this issue?**
Tried setting alarms based on CloudWatch EC2 metrics (disk) but it does not work well because the mount points are dynamic (When using EBS csi driver to satisfy pod dynamic volume requirements).

**Additional context**
I see that metrics are indeed available - when I run:
kubectl get --raw /api/v1/nodes/HOST/proxy/metrics | grep 'kubelet_volume_stats_available_bytes'
I do get results but I expect that these would be available in CloudWatch.

Also I have raised an issue with the ebs-csi-driver team @ https://github.com/kubernetes-sigs/aws-ebs-csi-driver/issues/2056

**Attachments**
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No repository files or tests are identified. Start by reviewing the reported kubectl metrics query and the linked aws-ebs-csi-driver issue; done means kubelet_volume_stats_available_bytes and related aws-ebs-csi-driver storage metrics are ingested into CloudWatch for EKS clusters using Container Insights.

Written by the indexing model from the issue text.