hypervisor: Introduce mshv module in the hypervisor

This is the initial folder structure of the mshv module inside
the hypervisor crate. The aim of this module is to support Microsoft
Hyper-V as a supported Hypervisor.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

Cargo.toml

@@ -52,6 +52,7 @@ acpi = ["vmm/acpi"]
 cmos = ["vmm/cmos"]
 fwdebug = ["vmm/fwdebug"]
 kvm = ["vmm/kvm"]
+mshv = ["vmm/mshv"]
 io_uring = ["vmm/io_uring"]
 
 # Integration tests require a special environment to run in