Add support for GLTF Serializer

[SergioRZMasson]

Currently it is not possible to use the GLTF Serializer functionality due some missing Polyfills. Calling GLTF2Export.GLBAsync directly is not possible because Native does not have a implementation for Blob. It is simple to modify GLBAsync to export an ArrayBufferView instead. However, when serializing models with textures we also need OffscreenCanvas. Since this class does not exist in Native we get an exception in the serializer level.