Support external etcd service

[cumirror]

Your current KubeKey version

No response

Describe this feature

Currently kk automatically create a built-in etcd cluster on master nodes when creating a k8s cluster.
In some scenarios, users may have their own etcd cluster and want to use it in k8s. Can kk support such scenarios?

Describe the solution you'd like

kk should support etcd endpoints configuration.
If there is such a configuration, kk skips the creation of etcd cluster and sets the endpoints to k8s apiserver.

Additional information

No response

[pixiake]

#1122