add support for file sharing

[lstocchi]

it adds support for file sharing.

On Hyper-v it uses a similar mechanism as done by podman to support 9P.
9P server only differs for the signal-based shutdown instead of checking that gvproxy is running.
On the guest, we do not rely on the podman' client9p command but use socat to proxy a connection from vsock to unix socket and mount the files. More info at cfergeau/podman#41

On draft as it needs cfergeau/podman#41 to be merged and be tested on all OSes

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[lstocchi]

@redbeam could you give this a review on Windows? It needs to be tested on Hyper-v.