Re: [streams] explicity operate on underlying source and sink instead of public methods (#321)

I guess I would recommend creating "Write to sink" algorithms that are associated with the stream.  Then ReadableStream.pipeTo() could say "using destination streams Write to sink algorithm...".

A ReadableByteStream.pipeTo(), however, might say "using destinations Optimized Byte Write To Sink algorithm, if available, or falling back to Write To Sink algorithm, ..."

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