Include loaders for binary files like glb and wasm

Brought up on the forum here: https://groups.google.com/forum/#!topic/cesium-dev/t463ShjMtEI

The new Draco wasm file needs to be loaded using a wasm loader.

Additionally, glb files and other binary files need to be loaded using an appropriate binary loader as well. Since it's so common to load these into a Cesium app, they should be included here.

Start by inspecting the Webpack configuration and existing loader setup in the repository. Verify how the Draco wasm file, glb files, and other binary assets are imported and built, then confirm that a Cesium application can load them successfully through the example setup.

Written by the indexing model from the issue text.