Rust binding for this proposal

Hi there, here's from WasmEdge runtime.

Take the WASI-NN proposal for example, there's rust binding generated from the witx format.
Developers can use the witx-bindgen to generate the rust binding easily.
With this generated library, developers can call the WASI proposal APIs in rust and compile into WASM.

But currently the WASI proposals provides the wit format, which can be compiled into component model.
For the other WebAssembly runtimes, supporting the component model is not so easy and quickly due to its complexity.
To support this proposal, we should have:

• The ABI documentation in WASM, especially the host function parameter and return types in WASM.
• The rust binding to this proposal, in order to generate the test WASM invoking the host functions of this proposal.

Unfortunately, this WASI-WebGPU proposal doesn't provide the information for the API doc, which is the most important to implement this proposal.
Can you help to provide the rust binding and API doc so that developers can try to compile the WASM files without component?
Thanks!

Start by reviewing the WASI-WebGPU proposal and comparing its wit format with the WASI-NN example and generated witx Rust binding. Define the missing WASM ABI documentation, host function parameter and return types, and the Rust binding needed to generate test WASM without the component model. Done means developers can compile and use those bindings against the proposal.