WIP: Update snapshot v1 dependency

[xing-yang]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This PR updates snapshot dependency to v1.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
Depends on this PR: kubernetes-csi/external-snapshotter#389
Right now apis and clientset under external-provisioner/vendor/github.com/kubernetes-csi/external-snapshotter/client/v3 are manually copied as it is not released yet.

Does this PR introduce a user-facing change?:

Updates snapshot dependency to v1

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xing-yang

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[xing-yang]

/test pull-kubernetes-csi-external-provisioner-1-17-on-kubernetes-1-17

[xing-yang]

/test pull-kubernetes-csi-external-provisioner-1-18-on-kubernetes-1-18

[xing-yang]

/test pull-kubernetes-csi-external-provisioner-1-19-on-kubernetes-1-19

[xing-yang]

/test pull-kubernetes-csi-external-provisioner-1-17-on-kubernetes-1-17

[k8s-ci-robot]

@xing-yang: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kubernetes-csi-external-provisioner-1-18-on-kubernetes-1-18	2b93551	link	/test pull-kubernetes-csi-external-provisioner-1-18-on-kubernetes-1-18
pull-kubernetes-csi-external-provisioner-1-19-on-kubernetes-1-19	2b93551	link	/test pull-kubernetes-csi-external-provisioner-1-19-on-kubernetes-1-19
pull-kubernetes-csi-external-provisioner-1-17-on-kubernetes-1-17	2b93551	link	/test pull-kubernetes-csi-external-provisioner-1-17-on-kubernetes-1-17

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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