Re: [whatwg/streams] Add support for ReadableStream "owning" type (PR #1271)

Hmm, how does this interact with transferable streams?

Sure, we transfer in `controller.enqueue()` to push the chunk onto the stream's queue. But if the stream has been transferred, then:
* the cross-realm writable we create should also be of type `owning`
* the message we post through the internal `MessagePort` containing the chunk should have a proper transfer list

To support this, I think we'll have to store the transfer list alongside each chunk in the queue, so we can re-transfer the chunk later on. 🤔

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