feat: re-implement (native) Gizmo class, expose preserveScaling parameter for setParent, add methods for getting viewport bounding box from renderable entity

thermion_dart/native/web/CMakeLists.txt

@@ -55,6 +55,7 @@ add_executable(${MODULE_NAME}
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/FilamentViewer.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/ThermionDartApi.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/ThermionDartFFIApi.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/../src/Gizmo.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/StreamBufferAdapter.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/TimeIt.cpp"
   "${CMAKE_CURRENT_SOURCE_DIR}/../src/camutils/Manipulator.cpp"