Update to PhysX 5 when possible

[philpax]

At present, we are using PhysX 4.1 through https://crates.io/crates/physx-sys. If it makes sense to, we'd like to update to PhysX 5 when EmbarkStudios/physx-rs#183 lands - we have not done a thorough investigation of what it enables yet.

Additionally, we have our own custom bindings atop physx-rs. This will take a fair bit of time to update as well.

[C-BJ]

EmbarkStudios/physx-rs#183 seems to be merged

[philpax]

It has, nicely spotted! We're a little concerned about ARM64 macOS support and WebAssembly support; it looks like Embark have patched the former, but I'm not sure about the latter. We'll be keeping an eye on this and making a decision at some point.

[Jake-Shadle]

We don't compile physx for wasm ourselves but we'll gladly take patches that add/fix support that include CI to ensure it doesn't break in the future.