Add SHADERINT_16 feature to allow 16bit ints in Vulkan shaders

[Elabajaba]

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
Stops Vulkan Validation errors for FSR2 when using https://github.com/JMS55/fsr2_wgpu (currently very much a WIP).

Description
This just enables the Vulkan shader_int16 device feature if the feature is requested. I copied how it seems to be done for SHADER_FLOAT64.

According to the docs, this isn't an extension and is part of vulkan 1.0 VkPhysicalDeviceFeatures. I don't know if anything doesn't support this feature, so I'm wondering if it should be enabled by default? Did some more digging on https://vulkan.gpuinfo.org/ and it isn't nearly as universal as I thought.

Testing
Tested using bevy+fsr2, it stopped the validation errors about 16bit ints.

[crowlKats]

don't forget to update deserialize_features in deno_webgpu/src/lib.rs, and update the GPUFeatureName enum in deno_webgpu/src/02_idl_types.js

[teoxoy]

Wanted to mention that I filed #3406; not a blocker for this PR but something to put on our radar.

[Elabajaba]

don't forget to update deserialize_features in deno_webgpu/src/lib.rs, and update the GPUFeatureName enum in deno_webgpu/src/02_idl_types.js

Does the GPUFeatureName enum in deno_wgpu/webgpu.idl also have to be updated?

edit: Also, is i16 support considered to be extended from spec?

edit2: To answer my own question, it looks like webgpu.idl shouldn't be updated, and it should be considered an extension of the spec.

Does deno_webgpu want what are potentially native only features?

[crowlKats]

Does deno_webgpu want what are potentially native only features?

yes; if my memory serves right, the spec states that the implementer can extend the standard set of features. we just allow all features that wgpu has, because why not.

[Elabajaba]

I think this should be done now.

[crowlKats]

thanks!

[crowlKats]

Deno part looks good to me.

requested changes have been made