added texture metadata

[kurtkuehnert]

Description

This PR exposes the metadata/attributes of a Texture, according to the WebGpu spec: https://www.w3.org/TR/webgpu/#gputexture.

This is a draft because I am unsure how to set those attributes for the SurfaceTextures (see the Todo).
I would appreciate any guidance you can give me.

[cwfitzgerald]

G2G after some small things

[codecov-commenter]

Codecov Report

Merging #3346 (7f48771) into master (186a29c) will increase coverage by 0.06%.
The diff coverage is 8.06%.

@@            Coverage Diff             @@
##           master    #3346      +/-   ##
==========================================
+ Coverage   64.43%   64.50%   +0.06%     
==========================================
  Files          86       86              
  Lines       42622    42691      +69     
==========================================
+ Hits        27462    27536      +74     
+ Misses      15160    15155       -5     

Impacted Files	Coverage Δ
wgpu/src/lib.rs	51.14% <8.06%> (-0.09%)	⬇️
wgpu-hal/src/dx12/command.rs	73.46% <0.00%> (-0.29%)	⬇️
wgpu-hal/src/vulkan/device.rs	75.84% <0.00%> (-0.07%)	⬇️
wgpu-hal/src/dx12/mod.rs	27.27% <0.00%> (ø)
wgpu/src/context.rs	53.32% <0.00%> (+0.04%)	⬆️
wgpu/src/backend/direct.rs	56.87% <0.00%> (+0.05%)	⬆️
wgpu-core/src/hub.rs	60.82% <0.00%> (+0.15%)	⬆️
wgpu-hal/src/dx12/descriptor.rs	88.11% <0.00%> (+0.49%)	⬆️
wgpu-hal/src/vulkan/instance.rs	38.37% <0.00%> (+0.76%)	⬆️
... and 3 more

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[cwfitzgerald]

Thanks!