scsi: Add virtio daemon

This adds the virtio-specific parts that use the previously formed
interfaces and scsi emulation in order to build a daemon that offers files
from the host system as drives to the guest.

The vast majority of this work was done by Gaelan Steele as part of a
GSoC project [1][2].

[1] #4
[2] https://gist.github.com/Gaelan/febec4e4606e1320026a0924c3bf74d0

Co-developed-by: Erik Schilling <[email protected]>
Signed-off-by: Erik Schilling <[email protected]>
Signed-off-by: Gaelan Steele <[email protected]>

Author: Erik Schilling

crates/scsi/src/lib.rs

@@ -1 +1,2 @@
 pub mod scsi;
+pub mod virtio;