Re: [whatwg/dom] Abort controller (#437)

Some additional info:

We expose signals on request objects so they're (eventually) visible within a service worker, and signal the page's intent to abort the request.

We use a copy because we can't use a reference once the request goes to a service worker. Also, we have plans to introduce a `FetchSignal` later which includes other fetch-specific signals, such as priority changes. By specifying a copy we avoid having request objects with signals that are sometimes null, and sometimes different types.

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