Re: [whatwg/dom] Allow postMessage-ing AbortSignal (#948)

Just an update on this... we recently just landed early support for this in Node.js.  When sending an `AbortSignal` over postMessage, a new `AbortSignal` is created on the receiving end connected to the original via a `MessagePort`. When the original signal is triggered, it has an abort algorithms that sends a message over the `MessagePort` that triggers the other. Very simple and straightforward. The key caveat is that there is some latency between when the original `AbortSignal` is triggered and when the newly created one is triggered due to the message passing infrastructure (in Node.js there's one event loop turn required)

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