hypervisor: Introduce VM state to Vm hypervisor trait

We may need to store hypervisor speciific data to the VM. This support is
needed for Microsoft hyperv implementations. This patch introduces two
new definitions to Vm trait and implements for KVM.

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

hypervisor/src/lib.rs

@@ -52,6 +52,7 @@ pub use kvm::*;
 pub use vm::{DataMatch, HypervisorVmError, Vm};
 
 use std::sync::Arc;
+
 pub fn new() -> std::result::Result<Arc<dyn Hypervisor>, HypervisorError> {
     #[cfg(feature = "kvm")]
     let hv = kvm::KvmHypervisor::new()?;