Add support for a multi-zone volumeHandle

[pwschuurman]

What type of PR is this?
/kind feature

What this PR does / why we need it:
A pattern in Kubernetes Deployment workloads is to use a single ROX PV, in the pod volumes template. When running a Deployment that runs in multiple zones, a user may want to leverage content backed on a PD. This PR adds support for "multi-zone" volumeHandles, allowing the PDCSI to interpret this as a placeholder the zone that a compute instance is running in.

Which issue(s) this PR fixes:
Fixes #1591

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Add support for multi-zone volumeHandle

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pwschuurman

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[pwschuurman]

/assign @msau42

[msau42]

/lgtm

[pwschuurman]

/retest

[pwschuurman]

/retest

[pwschuurman]

/assign @mattcary

[mattcary]

/lgtm

[mattcary]

/lgtm

[amacaskill]

/cherry-pick release-1.13

[k8s-infra-cherrypick-robot]

@amacaskill: #1593 failed to apply on top of branch "release-1.13":

Applying: Add support for a multi-zone volumeHandle
Using index info to reconstruct a base tree...
M	cmd/gce-pd-csi-driver/main.go
M	pkg/gce-pd-csi-driver/controller.go
M	test/e2e/tests/multi_zone_e2e_test.go
M	test/e2e/tests/resize_e2e_test.go
M	test/e2e/tests/single_zone_e2e_test.go
M	test/e2e/utils/utils.go
Falling back to patching base and 3-way merge...
Auto-merging test/e2e/utils/utils.go
Auto-merging test/e2e/tests/single_zone_e2e_test.go
Auto-merging test/e2e/tests/resize_e2e_test.go
Auto-merging test/e2e/tests/multi_zone_e2e_test.go
Auto-merging pkg/gce-pd-csi-driver/controller.go
Auto-merging cmd/gce-pd-csi-driver/main.go
CONFLICT (content): Merge conflict in cmd/gce-pd-csi-driver/main.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Add support for a multi-zone volumeHandle
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.13

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