Start using hashbrown

[brody4hire]

Connections

• help prepare for no-std support in wgpu-core ref: Support no_std where possible (specifically for wasm32v1-none) #6826

Description

see title

Use hashbrown in wgpu-core, wgpu-hal & wgpu-info to simplify no-std support. (This may help improve performance as well.)

Holding off on updating the following crates to use hashbrown:

• naga - I encountered some build issues with spirv::Capability. I think using hashbrown in naga would be good for no-std build, without the spirv-related feature.
• main wgpu crate - I encountered some issues testing with webgpu backend & did not feel like introducing a possibly breaking change to the public API. I may revisit this (someday).

Testing

• cargo build --all-features -p wgpu-core

Checklist

• Run cargo fmt.
• Run taplo format.
• Run cargo clippy. If applicable, add:
  • --target wasm32-unknown-unknown
  • --target wasm32-unknown-emscripten
• Run cargo xtask test to run tests.
• Add change to CHANGELOG.md. See simple instructions inside file.

[bushrat011899]

Definitely needed. Bevy relied on hashbrown prior to my no_std work anyway, so the transition wasn't too bad. Without switching to hashbrown, the alternative would be refactoring code to not use sets or maps at all, which is likely far more pain than the extra dependency would introduce.

[bushrat011899]

Looks good to me!

[brody4hire]

I think this should be ready now, thanks everyone for the quick reviews.