[whatwg/dom] Expose Event, EventTarget to AudioWorklet (#515)

cc:

[Related issue from Web Audio API](https://github.com/WebAudio/web-audio-api/issues/1266#issuecomment-311513537)

The propose change is:
```webidl
[Constructor(DOMString type, optional EventInit eventInitDict),
 Exposed=(Window,Worker,AudioWorklet)]
interface Event { ... }

[Constructor,
 Exposed=(Window,Worker,AudioWorklet)]
interface EventTarget { ... }
```

If this looks okay, I'll submit a PR shortly.

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