runtime: forward the stat and resize requests from shimv2 to kata agent

Translate the volume path from host-known path to guest-known path
and forward the request to kata agent.

Fixes: #3454

Signed-off-by: Feng Wang <feng.wang@databricks.com>

src/runtime/virtcontainers/pkg/vcmock/sandbox.go

@@ -254,3 +254,10 @@ func (s *Sandbox) GetAgentURL() (string, error) {
 func (s *Sandbox) GetHypervisorPid() (int, error) {
 	return 0, nil
 }
+
+func (s *Sandbox) GuestVolumeStats(ctx context.Context, path string) ([]byte, error) {
+	return nil, nil
+}
+func (s *Sandbox) ResizeGuestVolume(ctx context.Context, path string, size uint64) error {
+	return nil
+}