An ipscene flatbuffer asset (root: fb::Scene) is able to be directly deserialized into an std::shared_ptr<impeller::scene::Node> within UI, which can then be passed to Impeller through a DisplayList op.

• Load the ipscene flatbuffer file.
• Decode all texture assets in the Scene->textures list through the normal image decoder flow to produce DlTextures.
• Fire off a raster task to deserialize the scene by calling scene::Node::MakeFromFlatbuffer with the ipscene flatbuffer, the list of decoded Impeller texture handles (which should match the exact order of Scene->textures; pass nullptr for any images that failed to decode), and the allocator from the Impeller context (UIDartState::Current()->GetIOManager()->GetImpellerContext()).