Implement device_features and adapter_features for the web backend

[expenses]

Checklist

• Run cargo clippy.
• Run RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknown if applicable.
• Add change to CHANGELOG.md. See simple instructions inside file.

Connections

Description

These weren't implemented and I needed in order to be able to check for compressed texture support. I had to do an unchecked cast of the GPUSupportedFeatures class to a js_sys::Set because it doesn't seem like wasm-bindgen implements setlike and thus doesn't have a has method.

I also added some BC formats to the texture format mapping function because my code needed them. We of-course should implement all of these in time, but I didn't want to do that here.

Testing

Tested by running a program that checks for compressed texture support and renders a model with compressed textures.

[expenses]

I had to do an unchecked cast of the GPUSupportedFeatures class to a js_sys::Set because it doesn't seem like wasm-bindgen implements setlike and thus doesn't have a has method.

We should probably find a solution to this before merging.

[jimblandy]

Just marking this as "Draft", based on comments and title.

[codecov-commenter]

Codecov Report

Merging #2986 (0067020) into master (ad4dac8) will increase coverage by 17.60%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2986       +/-   ##
===========================================
+ Coverage   47.62%   65.22%   +17.60%     
===========================================
  Files          86       86               
  Lines       42697    42725       +28     
===========================================
+ Hits        20335    27868     +7533     
+ Misses      22362    14857     -7505     

Impacted Files	Coverage Δ
wgpu/src/lib.rs	51.06% <0.00%> (-0.09%)	⬇️
wgpu-core/src/device/queue.rs	70.17% <0.00%> (+0.10%)	⬆️
wgpu-core/src/device/mod.rs	66.70% <0.00%> (+0.27%)	⬆️
wgpu-core/src/instance.rs	65.67% <0.00%> (+0.81%)	⬆️
wgpu-hal/src/lib.rs	26.92% <0.00%> (+0.96%)	⬆️
wgpu-core/src/hub.rs	61.13% <0.00%> (+2.15%)	⬆️
wgpu-types/src/lib.rs	88.06% <0.00%> (+2.56%)	⬆️
wgpu-core/src/track/buffer.rs	92.14% <0.00%> (+7.27%)	⬆️
wgpu-core/src/track/texture.rs	80.97% <0.00%> (+21.51%)	⬆️
wgpu-hal/src/vulkan/instance.rs	38.37% <0.00%> (+37.35%)	⬆️
... and 13 more

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[expenses]

Think this is about ready - I had some problems running the demos on chrome though so it'd be great if someone could check them before merging.

[cwfitzgerald]

Looks good after nit

[gents83]

Trying to implement it directly in wasm-bindgen: rustwasm/wasm-bindgen#3268

[cwfitzgerald]

@gents83 thank you so much for that work!