https://gpuweb.github.io/gpuweb/wgsl/#processing-errors

TODO: Update the WebGPU spec, referring back to the three kinds of errors defined here.

One particular aspect is figuring out how "uncategorized errors" are exposed. Is it useful to expose them from createShaderModule? If not, errors occurring in shader creation can be stored and returned later in createPipeline. And should they be exposed to the error scope as a "validation" error or something else?