CRN API for VM administration

[hoh]

As a user of the aleph.im network and creator of a virtual machine, I can administer my virtual machine from an HTTP API provided by the VM supervisor on Compute Resource Nodes.

I must be able to perform the following operations:

• [ ] reboot a VM that appears to be unresponsive
• [ ] shutdown a VM while keeping it planned and paying for it (ex: emergency shutdown)
• [ ] reset a VM: delete all persistent data and reboot
• [ ] read the logs of a VM
• [ ] stream the logs of a VM live
• [ ] view metrics of the VM
• [ ] view the specifications and IP addresses of the VM
• [ ] view a list of snapshots of the VM

Features not considered in this ussue:

• login the VM via a remote console in the browser
• recovery console boots another OS with the partition mounted
• reset the SSH keys of the VM (should use a new message)
• resize the volumes (should use a new message)

[hoh]

Related to https://github.com/aleph-im/aleph-vm/issues/106

[hoh]

Related to #382