Shared Array Buffer 🪄

When we pull the model from the wire, we should write it into a shared array buffer:
https://rustwasm.github.io/wasm-bindgen/examples/raytrace.html

This will reduce memory usage, ideally peak memory usage should be ~model size. Loading will require some magic.

Start with the linked wasm-bindgen raytrace example, then trace how ratchet pulls the model from the wire. Done means the model is written into a shared array buffer and peak memory usage is approximately the model size; the issue does not name a file or test.

Written by the indexing model from the issue text.