Re: [whatwg/streams] Support transferable streams (postMessage) (#1053)

This is ready for review. @domenic and @MattiasBuelens PTAL.

There's a minor issue that I haven't figured out how to link `{{MessagePort}}'s transfer steps`. Probably it will require an editorial change to the HTML standard, or maybe it's not worth the effort.

I need to check I don't have any gaps in my tests and port them to wpt, but I don't expect that to take long.

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