[whatwg/streams] Using streams from other specs: define a byte-counting strategy (#1085)

In particular, define one that consults internal slots, as opposed to `ByteLengthQueuingStrategy`'s JavaScript property lookup.

Useful for https://github.com/WICG/serial/pull/105#discussion_r523232500

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Received on Monday, 16 November 2020 20:27:15 UTC