Add command to move nodes between namespaces

[kradalby]

With the new "thorn down barriers" between namespaces, users might be in the need to move nodes from one namespace to another.

Add a command to move a node from one namespace to another, maybe something like:

headscale nodes move --identifier <machine_id> --namespace <new_namespace_id>

[kazauwa]

I'd like to help with implementing this feature, if it's not taken.

[kradalby]

It has not, feel free to give it a go :), can you assign yourself?

[kazauwa]

I don't think so
At least there is no active option for assigning in the UI on my side.

[restanrm]

I think this can be closed since it's #569 is
merged