[heycam/webidl] Should `includes` be allowed as operation names? (#767)

`includes` has been a reserved keyword since we introduced mixins, but IndexedDB is using that word for an operation: https://github.com/w3c/IndexedDB/commit/98b28b9890eb92b36eaadbedb31cea2d3bcd64aa

```webidl
[Exposed=(Window,Worker)]
interface IDBKeyRange {
  // -- snip --

  boolean _includes(any key);
};
```

@bzbarsky raised a concern that we shouldn't force escaping here. What do you think?

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