webidl: webgpu: make the size argument to copyBufferToBuffer optional
#4508
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This matches the latest spec.
There is also a 3-argument overload of
copyBufferToBuffer, which I have not added, as it poses some additional challenges, and I do not immediately need it.See https://www.w3.org/TR/webgpu/#commands-buffer-copies for context for the following explanation.
The logic in wasm-bindgen that generates unique names for the different overloads does not understand that the 3-argument overload is omitting the 2nd and 4th arguments to the 5-argument overload. So it generates names based on every argument starting with the 2nd, which (1) changes existing names for variants of the 5-argument overload, (2) includes
with_gpu_bufferfor the 3rd argument in the names even though that has no actual disambiguation purpose.