Introduce external snapshotter and snapshot controller for VolumeSnapshot support

[hlts2]

WHAT

I have added k8s manifest for VolumeSnapshot support.
This PR contains the following components.

• external-snapshotter sidecar
  • This compoent watches the Kubernetes API server for VolumeSnapshotContent CRD objects.
• snapshot controller
  • The component will be watching the Kubernetes API server for VolumeSnapshot and VolumeSnapshotContent CRD objects. The CSI external-snapshotter sidecar only watches the Kubernetes API server for VolumeSnapshotContent CRD objects. The snapshot controller will be creating the VolumeSnapshotContent CRD object which triggers the CSI external-snapshotter sidecar to create a snapshot on the storage system.

WHY

We have plan to support VolumeSnapshot in the civo-csi driver.
Apart from the implementation of csi driver handler, the k8s manifest also needs to be added, so it will be added in this PR.

⚠️ FYI

• The csi-snapshotter is in error, but this error will be fixed after driver implementation(Create, Delete, List handler) is complete.
  

• The following is an error message

❯ stern civo-csi-controller -c csi-snapshotter
+ civo-csi-controller-0 › csi-snapshotter
civo-csi-controller-0 csi-snapshotter I1202 05:23:57.914070       1 main.go:108] Version: v8.1.0
civo-csi-controller-0 csi-snapshotter I1202 05:23:57.914820       1 connection.go:234] "Connecting" address="unix:///var/lib/kubelet/plugins/csi.civo.com/csi.sock"
civo-csi-controller-0 csi-snapshotter I1202 05:23:57.916350       1 connection.go:264] "GRPC call" method="/csi.v1.Identity/GetPluginInfo" request="{}"
civo-csi-controller-0 csi-snapshotter I1202 05:23:57.916870       1 connection.go:270] "GRPC response" response="{\"name\":\"csi.civo.com\",\"vendor_version\":\"0.0.1\"}" err=null
civo-csi-controller-0 csi-snapshotter I1202 05:23:57.916881       1 main.go:190] CSI driver name: "csi.civo.com"
civo-csi-controller-0 csi-snapshotter I1202 05:23:57.916891       1 common.go:143] "Probing CSI driver for readiness"
civo-csi-controller-0 csi-snapshotter I1202 05:23:57.916911       1 connection.go:264] "GRPC call" method="/csi.v1.Identity/Probe" request="{}"
civo-csi-controller-0 csi-snapshotter I1202 05:23:58.743969       1 connection.go:270] "GRPC response" response="{\"ready\":{\"value\":true}}" err=null
civo-csi-controller-0 csi-snapshotter I1202 05:23:58.744022       1 connection.go:264] "GRPC call" method="/csi.v1.Controller/ControllerGetCapabilities" request="{}"
civo-csi-controller-0 csi-snapshotter I1202 05:23:58.744627       1 connection.go:270] "GRPC response" response="{\"capabilities\":[{\"Type\":{\"Rpc\":{\"type\":1}}},{\"Type\":{\"Rpc\":{\"type\":2}}},{\"Type\":{\"Rpc\":{\"type\":3}}},{\"Type\":{\"Rpc\":{\"type\":4}}},{\"Type\":{\"Rpc\
":{\"type\":9}}}]}" err=null
civo-csi-controller-0 csi-snapshotter E1202 05:23:58.744646       1 main.go:221] CSI driver csi.civo.com does not support ControllerCreateSnapshot
- civo-csi-controller-0 › csi-snapshotter

I will add an example manifest after all the implementation is complete.

[hlts2]

@RealHarshThakur
Thank you for reviewing this PR!
I will merge it 🚀