add setBoneTransform method

example/lib/menus/asset_submenu.dart

@@ -55,6 +55,17 @@ class _AssetSubmenuState extends State<AssetSubmenu> {
                       .transformToUnitCube(ExampleWidgetState.shapes!);
                 },
           child: const Text('Transform to unit cube')),
+      MenuItemButton(
+          onPressed: ExampleWidgetState.shapes == null
+              ? null
+              : () async {
+                  await widget.controller.setBoneTransform(
+                      ExampleWidgetState.shapes!,
+                      "Cylinder",
+                      0,
+                      Matrix4.rotationX(pi / 2));
+                },
+          child: const Text('Set bone tranform to identity for Cylinder')),
       MenuItemButton(
           onPressed: () async {
             var names = await widget.controller