Add ControllerServer.GetSnapshot CSI procedure

[nixpanic]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test

/kind feature

/kind flake

What this PR does / why we need it:

The new ControllerServer.GetSnapshot CSI procedure has been added to the specification. This should be implemented in the csi-driver-hostpath so that other components can use it for testing.

Which issue(s) this PR fixes:

Related to kubernetes-csi/csi-test#573

Special notes for your reviewer:

Marked as Draft because there is no CSI spec release with the new GetSnapshot procedure yet.

Does this PR introduce a user-facing change?:

Add support for the new ControllerServer.GetSnapshot CSI procedure.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[nixpanic]

/test all

Nothing should break 🤞

[k8s-ci-robot]

@nixpanic: 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-kubernetes-csi-csi-driver-host-distributed-on-kubernetes-1-28	a3e2af9	link	false	/test pull-kubernetes-csi-csi-driver-host-distributed-on-kubernetes-1-28
pull-kubernetes-csi-csi-driver-host-path-1-32-test-on-kubernetes-1-32	a3e2af9	link	false	/test pull-kubernetes-csi-csi-driver-host-path-1-32-test-on-kubernetes-1-32
pull-kubernetes-csi-csi-driver-host-path-1-31-test-on-kubernetes-1-31	a3e2af9	link	false	/test pull-kubernetes-csi-csi-driver-host-path-1-31-test-on-kubernetes-1-31
pull-kubernetes-csi-csi-driver-host-path-1-30-test-on-kubernetes-1-30	a3e2af9	link	false	/test pull-kubernetes-csi-csi-driver-host-path-1-30-test-on-kubernetes-1-30
pull-kubernetes-csi-csi-driver-host-path-1-30-on-kubernetes-1-30	a3e2af9	link	true	/test pull-kubernetes-csi-csi-driver-host-path-1-30-on-kubernetes-1-30
pull-kubernetes-csi-csi-driver-host-path-1-32-on-kubernetes-1-32	a3e2af9	link	false	/test pull-kubernetes-csi-csi-driver-host-path-1-32-on-kubernetes-1-32
pull-kubernetes-csi-csi-driver-host-path-1-31-on-kubernetes-1-31	a3e2af9	link	true	/test pull-kubernetes-csi-csi-driver-host-path-1-31-on-kubernetes-1-31

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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[nixpanic]

A panic happens:

+ kubectl logs csi-hostpathplugin-98n5w csi-provisioner
W0528 09:08:30.734604       1 feature_gate.go:354] Setting GA feature gate Topology=true. It will be removed in a future release.
I0528 09:08:30.734723       1 feature_gate.go:387] feature gates: {map[Topology:true]}
I0528 09:08:30.734762       1 csi-provisioner.go:166] "Version" version="v5.2.0"
I0528 09:08:30.734774       1 csi-provisioner.go:189] Building kube configs for running in cluster...
I0528 09:08:30.735052       1 envvar.go:172] "Feature gate default state" feature="ClientsAllowCBOR" enabled=false
I0528 09:08:30.735090       1 envvar.go:172] "Feature gate default state" feature="ClientsPreferCBOR" enabled=false
I0528 09:08:30.735099       1 envvar.go:172] "Feature gate default state" feature="InformerResourceVersion" enabled=false
I0528 09:08:30.735107       1 envvar.go:172] "Feature gate default state" feature="WatchListClient" enabled=false
I0528 09:08:30.735787       1 connection.go:234] "Connecting" address="unix:///csi/csi.sock"
I0528 09:08:30.736893       1 common.go:143] "Probing CSI driver for readiness"
I0528 09:08:30.736926       1 connection.go:264] "GRPC call" method="/csi.v1.Identity/Probe" request="{}"
I0528 09:08:30.738315       1 connection.go:270] "GRPC response" response="{}" err=null
I0528 09:08:30.738392       1 connection.go:264] "GRPC call" method="/csi.v1.Identity/GetPluginInfo" request="{}"
I0528 09:08:30.739400       1 connection.go:270] "GRPC response" response="{\"name\":\"hostpath.csi.k8s.io\",\"vendor_version\":\"v1.16.0-20-g3fb2665\"}" err=null
I0528 09:08:30.739465       1 csi-provisioner.go:244] Detected CSI driver hostpath.csi.k8s.io
I0528 09:08:30.739486       1 connection.go:264] "GRPC call" method="/csi.v1.Identity/GetPluginCapabilities" request="{}"
I0528 09:08:30.740548       1 connection.go:270] "GRPC response" response="{\"capabilities\":[{\"service\":{\"type\":\"CONTROLLER_SERVICE\"}},{\"service\":{\"type\":\"GROUP_CONTROLLER_SERVICE\"}},{\"service\":{\"type\":\"VOLUME_ACCESSIBILITY_CONSTRAINTS\"}}]}" err=null
I0528 09:08:30.740602       1 connection.go:264] "GRPC call" method="/csi.v1.Controller/ControllerGetCapabilities" request="{}"
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x1b8ae42]

goroutine 1 [running]:
github.com/kubernetes-csi/csi-lib-utils/protosanitizer.stripSingleValue({0x263df28, 0xc00031f680}, {{}, 0x1de98a0?, 0x0?, 0x1de9120?})
	/workspace/vendor/github.com/kubernetes-csi/csi-lib-utils/protosanitizer/protosanitizer.go:71 +0x82
github.com/kubernetes-csi/csi-lib-utils/protosanitizer.stripValue({0x263df28, 0xc00031f680}, {{}, 0x1de98a0?, 0x0?, 0xc0005029e8?})
	/workspace/vendor/github.com/kubernetes-csi/csi-lib-utils/protosanitizer/protosanitizer.go:94 +0x1b8
github.com/kubernetes-csi/csi-lib-utils/protosanitizer.stripMessage.func1({0x263df28, 0xc00031f680}, {{}, 0x1de98a0?, 0x0?, 0xc0002569d0?})
	/workspace/vendor/github.com/kubernetes-csi/csi-lib-utils/protosanitizer/protosanitizer.go:108 +0xdc
...

Reported kubernetes-csi/external-provisioner#1382 to get a release with the (already merged) fix.