Re: [w3c/webcomponents] How to define APIs only for custom element authors (#758)

```ElementInternals``` sounds good.  If no one objects it, let's adopt it.

@alice @caridy I also suppose flatten structure.  ```ElementInternals``` interface has attributes/operations for various features such as accessibility, form controls, ...

@trusktr I'm not sure I understand what you wrote correctly. Probably such feature list isn't necessary because we assume a single ```ElementInternals``` instance handles all features for the associated element?

Re: callback name
```createdCallback``` represents the timing when it is called, and doesn't represent the purpose. We may give more descriptive name like ```elementInternalsCreated```  ```receiveElementInternals```.


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