Consider changing around the feature items

[MendyBerger]

Consider changing gpu-supported-features and wgsl-language-features to flags, and remove gpu-feature-name.

gpu-supported-features and wgsl-language-features are defined in the spec as setlike<DOMString>, which is essentially a bag of bools, so flags would work nice for them.

gpu-supported-features can also be changed to gpu-features to take the place of both gpu-supported-features and gpu-feature-name.

gpu-device-descriptor.required-features - which is the only place gpu-feature-name is used - is currently option<list<gpu-feature-name>> and could just be changed to option<gpu-features>

[MendyBerger]

Worth looking in why webgpu.h didn't merge WGPUSupportedFeatures and WGPUFeatureName, unlike WGPULimits

[programmerjake]

WGPUFeatureName and WGPUFeatureName

that's the exact same name twice, was that intentional?

[MendyBerger]

Good catch! Updated.