PR to minimize JS conversion thrashing for GPU info

[apetrock]

Hi! I'm new here! I've been doing graphics, GPU, and geometry-adjacent work for nearly 17 years, currently on the Motif.io graphics/visualization team. While profiling in our Bevy app in wasm, I noticed that map_wgt_limits was showing up every frame, and that call was unusually expensive. Digging in, it became apparent that in a native environment wgpu-core stores the rust struct, so the query is just a clone. However, in wasm, there is no stored copy, that struct gets rebuilt from the JS object every call, Limits is a rather large struct, so the rebuild is non-trivial.

This PR aims to cache three info getters on WebAdapter and WebDevice: Limits, Features, and AdapterInfo.

[kpreid]

There is no need to create a discussion to accompany a PR. (If you want the problem to be tracked separately from the proposed solution, please create an issue instead.)

[apetrock]

OK, I thought it was useful to raise the PR, but I'm happy to create an issue, let the PR stand on it's own and delete this discussino entirely.