[heycam/webidl] Built-in module conventions (#755)

There's been a number of discussions around conventions for built-in modules, in particular:

* Enumerability of methods/accessors (see also #719)
* Same-realm brand checks (see also #718)
* Freezing

Let's figure out what we want, and involve TC39 in the discussion as well, potentially at the 23-25 July 2019 F2F meeting.

CC @domenic @annevk @bzbarsky

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