[#208] Print split ID in object.Head output of neofs-cli

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

cmd/neofs-cli/modules/object.go

@@ -653,6 +653,11 @@ func printHeader(cmd *cobra.Command, obj *object.Object, filename string) error
 		}
 		cmd.Printf("  %s=%s\n", attr.Key(), attr.Value())
 	}
+
+	if obj.SplitID() != nil {
+		cmd.Printf("SplitID: %s\n", obj.SplitID().String())
+	}
+
 	return nil
 }