Feat/support az multi parameter

[Mikey032]

Is this a bug fix or adding new feature?
New feature

What is this PR about? / Why do we need it?
Currently, cross-account mounts with dynamic provisioning and without DNS setup, only support mounting a single availability zone, either by providing a specific AZ or by not specifying any and receiving a random one. The AZ multi parameter returns a map of availability zone IDs with their respective mount target IPs to the PV. When combined with the node CSI driver querying the EC2 instance metadata endpoint for its own availability zone, allows it to automatically selects the mount target IP for a pod in the same availability zone.
When used with a multi-AZ EKS deployment, this reduces cross-AZ traffic costs and increases resilience. This does not disrupt the current logic.

What testing is done?
Unit tests have been updated, the logic has been verified on a cluster and EFS file system each in their own VPC and account attached to a transit gateway.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Mikey032 / name: Mikey Smet (4d604c4, 82592de, c77f4e4, 0964408)

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Mikey032
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[dankova22]

/ok-to-test

[Mikey032]

Hi @dankova22, were you able to review this already?

[k8s-ci-robot]

@Mikey032: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-aws-efs-csi-driver-external-test-eks	0964408	link	true	/test pull-aws-efs-csi-driver-external-test-eks

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.