wasm32-unknown-unknown build tracking

[simbleau]

The wasm32 architecture should be supported, otherwise there's a big risk this rust bevy runtime doesn't amount to much. There are some pretty big issues with this, particularly that rive-rs ( the parser library companion to this ) is heavily relied on by C++ and build.rs magic (see rive-app/rive-rs#3).

Filing this issue to track wasm32 support.