Add usage to TextureViewDescriptor

[sagudev]

Description
Spec says that we should obtain usage via TextureViewDescriptor: https://www.w3.org/TR/webgpu/#dom-gputextureviewdescriptor-usage, although by default it's is the same as in parent.

Testing
CTS run in servo: #6755 (comment)

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.

[sagudev]

Given that hal::TextureUses are generated independently of any TextureUsage:

wgpu/wgpu-core/src/device/resource.rs

Line 1251 in 89a8867

let usage = {

I think we just need to do validation against desc.usage when doing stuff on TextureView.

[sagudev]

CTS run in servo:

TIMEOUT [expected OK] /_webgpu/webgpu/cts.https.html?q=webgpu:api,validation,createView:texture_view_usage:*

OK /_webgpu/webgpu/cts.https.html?q=webgpu:api,validation,resource_usages,texture,in_render_misc:subresources,texture_view_usages:*
        PASS [expected FAIL] subtest: :bindingType="color-attachment";viewUsage=1
        PASS [expected FAIL] subtest: :bindingType="color-attachment";viewUsage=2
        PASS [expected FAIL] subtest: :bindingType="color-attachment";viewUsage=4
        PASS [expected FAIL] subtest: :bindingType="color-attachment";viewUsage=8
        PASS [expected FAIL] subtest: :bindingType="sampled-texture";viewUsage=1
        PASS [expected FAIL] subtest: :bindingType="sampled-texture";viewUsage=2
        PASS [expected FAIL] subtest: :bindingType="sampled-texture";viewUsage=8
        PASS [expected FAIL] subtest: :bindingType="sampled-texture";viewUsage=16
        PASS [expected FAIL] subtest: :bindingType="writeonly-storage-texture";viewUsage=1
        PASS [expected FAIL] subtest: :bindingType="writeonly-storage-texture";viewUsage=2
        And 2 more unexpected results...

[sagudev]

Servo is slow, but extending timeout and waiting half an hour gives:

[cwfitzgerald]

Looks good to me. Will let @teoxoy give final word before merging.