Re: [streams] How will ReadableByteStream work with seekable resources? (#253)

Shall we add a new mode to ReadableByteStream, say, manual feed mode, named after manual paper feed of printers.

ReadableByteStream would have a method named `.feedArrayBuffer(arrayBuffer, offset, size)`. Via this method, the user feeds a tuple of an ArrayBuffer, offset and size. The tuples are queued and used by the ReadableByteStream to create the result ArrayBuffers to return from the `.read()` method. How to interpret the `size` argument is up to the API that returns the ReadableByteStream. The `state` and `read()` are kept the same as `ReadableStream` but ArrayBuffer feeding happens asynchronous to them.

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