Re: [whatwg/dom] Define a 'CancellationController' and 'CancellationSignal' interface. (#434)

@domenic I know you were looking at this for TC39. It feels like this is something that should be a ECMAScript built-in that has a consistent API regardless of host environment (e.g. no dependency on EventTarget). Also, for the purposes of comparison, [this is the version](https://github.com/rbuckton/prex/blob/master/docs/cancellation.md) I've been discussing with @bterlson for the last year.

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