[heycam/webidl] Should callback interface objects have a "length" property (#279)

Callback interface objects already have a "name" property when exposed. The omission of a "length" prop (with value `0`) in the spec seems more accidental than deliberate. Chrome, Safari and Firefox all implement it, e.g.:

```js
 NodeFilter.length; //
0
```

NodeFilter.length
0


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