Add values.schema.json

[ElijahQuinones]

What type of PR is this?

/kind feature

What is this PR about? / Why do we need it?

This PR adds the values.schema.json file. Allowing us to make sure changes to helm chart parameters also appear in the eks add-on version of the driver as long as it makes sense to do so.

How was this change tested?

❯ helm lint .
==> Linting .
[INFO] Chart.yaml: icon is recommended

1 chart(s) linted, 0 chart(s) failed

Does this PR introduce a user-facing change?

Add values.schema.json to validate changes in values.yaml make it to the add-on schema.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[github-actions]

Code Coverage Diff

This PR does not change the code coverage

[k8s-ci-robot]

@ElijahQuinones: The following tests 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-ebs-csi-driver-external-test-arm64	8fd4a86	link	false	/test pull-aws-ebs-csi-driver-external-test-arm64
pull-aws-ebs-csi-driver-e2e-multi-az	8fd4a86	link	true	/test pull-aws-ebs-csi-driver-e2e-multi-az
pull-aws-ebs-csi-driver-e2e-single-az	8fd4a86	link	true	/test pull-aws-ebs-csi-driver-e2e-single-az
pull-aws-ebs-csi-driver-external-test	8fd4a86	link	true	/test pull-aws-ebs-csi-driver-external-test
pull-aws-ebs-csi-driver-external-test-eks	8fd4a86	link	true	/test pull-aws-ebs-csi-driver-external-test-eks
pull-aws-ebs-csi-driver-test-e2e-external-eks-windows	8fd4a86	link	true	/test pull-aws-ebs-csi-driver-test-e2e-external-eks-windows

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.

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