Re: [streams] Support reading bytes into buffers allocated by user code on platforms where only async read is available (#253)

(cont'd) Class definitions

```es6
class ReadableStream {
  closed
  read(container)
  cancel(reason)
  release()
}

class WritableStream {
  closed
  ready
  write(value)
  close()
  abort(reason)
  release()
}
```

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