add basic azure support for kargo

docs/azure.md

inventory/group_vars/all.yml

...tes/master/templates/manifests/kube-apiserver.manifest.j2

...r/templates/manifests/kube-controller-manager.manifest.j2

roles/kubernetes/node/templates/kubelet.j2

roles/kubernetes/preinstall/tasks/azure-credential-check.yml

roles/kubernetes/preinstall/tasks/main.yml

roles/kubernetes/preinstall/templates/azure-cloud-config.j2