Return a status code after provisioning scripts finish

### Description

When launching `limactl start`, a status code (e.g. by cloud-init) should be returned to allow easier scripting and identification of provisioning errors.

Currently, this can be achieved with something like `lima cloud-init status` but a more generic solution is needed (for example, when not using cloud-init).

As an additional consideration, how would you handle cases when it is not possible to ssh into the VM?