KEP-3314: updated to reflect the latest state

[carlbraganza]

Updated the KEP with relevant changes in the CSI spec and the external snapshot metadata sidecar repository.

[k8s-ci-robot]

Hi @carlbraganza. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carlbraganza
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[xing-yang]

/ok-to-test