add external hcloud cloud controller manager (#8440)

inventory/sample/group_vars/all/all.yml

inventory/sample/group_vars/all/hcloud.yml

...s-apps/external_cloud_controller/hcloud/defaults/main.yml

...etes-apps/external_cloud_controller/hcloud/tasks/main.yml

...-hcloud-cloud-controller-manager-ds-with-networks.yaml.j2

...lates/external-hcloud-cloud-controller-manager-ds.yaml.j2

...loud/templates/external-hcloud-cloud-role-bindings.yml.j2

...ller/hcloud/templates/external-hcloud-cloud-secret.yml.j2

...ud/templates/external-hcloud-cloud-service-account.yml.j2

...s/kubernetes-apps/external_cloud_controller/meta/main.yml

roles/kubespray-defaults/defaults/main.yaml