Support bootstraping kubeadm and rke2 nodes

[k0da]

We probably want to reuse cloud-init/ignition config generator from cluster-api and cluster-api-provider-rke2, so userData will be minimal to what extra needs to be setup on the nodes besides node join.

Introduce:

• distribution (kubeadm/rke2)
• keep the type could-init/ignition

[k0da]

rke2 and rke2airgapped has been implemented with cloud-config bootstrap type