runtime-rs: change hypervisor add_device trait to return device copy

Block(virtio-blk) and vfio devices are currently not handled correctly
by the agent as the agent is not provided with correct PCI paths for
these devices.

The PCI paths for these devices can be inferred from the PCI information
provided by the hypervisor when the device is added.
Hence changing the add_device trait function to return a device copy
with PCI info potentially provided by the hypervisor. This can then be
provided to the agent to correctly detect devices within the VM.

This commit includes implementation for PCI info update for
cloud-hupervisor for virtio-blk devices with stubs provided for other
hypervisors.

Removing Vsock from the DeviceType enum as Vsock currently does not
implement the Device Trait, it has no attach and detach trait functions
among others. Part of the reason is because these functions require Vsock
to implement Clone trait as these functions need cloned copies to be
passed down the hypervisor.

The change introduced for returning a device copy from the add_device
hypervisor trait explicitly requires a device to implement
Copy trait. Hence removing Vsock from the DeviceType enum for now, as
its implementation is incomplete and not currently used.

Note, one of the blockers for adding the Clone trait to Vsock is that it
currently includes a file handle which cannot be cloned. For Clone and
Device Traits to be implemented for Vsock, it requires an implementation
change in the future for it to be cloneable.

Fixes: #8283

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

src/runtime-rs/crates/resource/src/share_fs/share_virtio_fs.rs

@@ -89,9 +89,16 @@ pub(crate) async fn setup_inline_virtiofs(id: &str, h: &dyn Hypervisor) -> Resul
             prefetch_list_path: None,
         },
     };
-    h.add_device(DeviceType::ShareFsMount(virtio_fs))
+
+    let result = h
+        .add_device(DeviceType::ShareFsMount(virtio_fs))
         .await
-        .with_context(|| format!("fail to attach passthrough fs {:?}", source))
+        .with_context(|| format!("fail to attach passthrough fs {:?}", source));
+
+    match result {
+        Ok(_) => Ok(()),
+        Err(e) => Err(e),
+    }
 }
 
 pub async fn rafs_mount(