Explore Rust or other language bindings with Cesium Native

[j9liu]

This isn't something we're going to start working on (at the time of writing), but it's an idea that has been mentioned once or twice by now, and there's no harm in writing this down for future's sake.

There has been interest in having Rust / C# / Python bindings for Cesium Native, and Rust especially. It would be a considerable effort and isn't on our immediate roadmap for now. But if there is growing community interest in this item, we could have deeper conversations of what this effort would look like.