This goes up to webgpu-native/webgpu-headers@2b59747

Things I *didn't* do:

* I didn't update the library to make sure "instance dropped" callback
  error codes are guaranteed to happen, like they seem to be in Dawn.

List of changes (roughly in order of header commits):

Various enum and struct renames

Updated callbacks to use the new *CallbackInfo structs and 2-userdata system. Also updated functions to return WGPUFuture, though the WGPUFuture thing is just stubbed out at the moment as I don't think wgpu-core has the necessary functionality for it. wgpuInstanceWaitAny is unimplemented!()

DepthClipControl merged into PrimitiveState, related code simplified.

Updated depthWriteEnabled to use an optional bool, mostly matters due to added validation.

Add TODOs for missing features (sliced 3D compressed textures)

*Reference() became *AddRef()

Added unorm10-10-10-2 vertex format

Usage field in TextureViewDescriptor, just used for validation as wgpu-core doesn't allow specifying it anyways.

Removed maxInterStageShaderComponents

Added clang_macro_fallback to bindgen config, since the headers switched to using UINT32_MAX etc. UINT64_MAX still doesn't work so I had to manually define those.

Renamed flags enums. Added a conversion helper function to convert them from u64 -> u32 for mapping. (means added direct dependency on bitflags crate)

Removed device argument from (unimplemented) wgpuGetProcAddress

Suboptimal surface texture acquisition moved to enum return value, was easy since wgpu-core already returns it like that.

"Undefined" present mode added, it just selects FIFO.

This enum was replaced with WGPUMapAsyncStatus, but I didn't quite notice. The error codes map different.

Replaces *EnumerateFeatures with *GetFeatures.

Also fixes CI due to fix in headers.

Upstream removed the "Flags" suffix from flags types and moved them to no longer be C enums. This matches that change. WGPUInstanceFlag still has "Flag" in the name because, well, there'd be nothing left to distinguish it from WGPUInstance, and it makes sense for it.

Also updates wgpu.h to use WGPUStringView everywhere.