Introduce the `update_device` trait in Hypervisor to enable
device updates for VMMs.This trait will initially be utilized
for virtiofs Mount operations.

Fixes: kata-containers#7915

Signed-off-by: alex.lyn <alex.lyn@antgroup.com>

It mainly focus on the two parts:
(1) redesign the ShareFsConfig with ShareFsMountConfig

The device mount operation must depend on the fact that sharefs
device exists, and re-design the structure of SharesFsConfig and
move the ShareFsMountConfig into it with Option type, which is to
describe the relation between ShareFsConfig and ShareFsMountConfig.

(2) move virtiofs into device manager
Currently, virtio-fs is still outside of the device manager.
To do Enhancement of device manager, it will bring virtio-fs
device in device-manager for unified management

Fixes: kata-containers#7915

Signed-off-by: alex.lyn <alex.lyn@antgroup.com>

Fixes: kata-containers#7915

Signed-off-by: alex.lyn <alex.lyn@antgroup.com>