[heycam/webidl] Should `async` be allowed as an attribute name? (#768)

```webidl
[Exposed=Window,
 HTMLConstructor]
interface HTMLScriptElement : HTMLElement {
  // -- snip --
  [CEReactions] attribute boolean async;
  [CEReactions] attribute boolean defer;
  // -- snip --
};
```

The attribute [`async`](https://html.spec.whatwg.org/multipage/scripting.html#the-script-element:dom-script-async) now has an invalid syntax after #720. Should it be just escaped with `_async` or should we add `async` to `AttributeName`?

cc @Ms2ger @bzbarsky 

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