GCP Persistent Disk CSI Driver deployment (#5857)

docs/gcp-pd-csi.md

inventory/sample/group_vars/all/gcp.yml

inventory/sample/group_vars/k8s-cluster/k8s-cluster.yml

roles/download/defaults/main.yml

roles/kubernetes-apps/csi_driver/gcp_pd/defaults/main.yml

roles/kubernetes-apps/csi_driver/gcp_pd/tasks/main.yml

.../csi_driver/gcp_pd/templates/gcp-pd-csi-controller.yml.j2

...csi_driver/gcp_pd/templates/gcp-pd-csi-cred-secret.yml.j2

...s-apps/csi_driver/gcp_pd/templates/gcp-pd-csi-node.yml.j2

...-apps/csi_driver/gcp_pd/templates/gcp-pd-csi-setup.yml.j2

roles/kubernetes-apps/meta/main.yml

...etes-apps/persistent_volumes/gcp-pd-csi/defaults/main.yml

...ernetes-apps/persistent_volumes/gcp-pd-csi/tasks/main.yml

...umes/gcp-pd-csi/templates/gcp-pd-csi-storage-class.yml.j2

roles/kubernetes-apps/persistent_volumes/meta/main.yml

roles/kubespray-defaults/defaults/main.yaml