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

Rough consensus at TPAC F2F: We'll tentatively use `attachInternals` with static field indicating that the element internals should exist for a given custom element (so that it would work for subclasses) where calling it twice will throw but @domenic will consult with TC39 to see if there is a generic *protected* field mechanism that we should be using here.

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