[whatwg/streams] WebIDL syntax for parameterized streams? (#678)

For the encoding spec, I'd like to be able to write `ReadableStream<USVString>` to indicate a readable that vends string chunks, and `WritableStream<BufferSource>` to indicate a writable that accepts chunks consisting of [buffers of data](https://www.w3.org/TR/WebIDL-1/#es-buffer-source-types).

But this doesn't work. Should it?

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