[heycam/webidl] Allowing something to be the serializer and stringifier (#260)

For https://github.com/whatwg/url/issues/137 we want URL's href attribute to also be the value the serializer returns. However, it's already the stringifier and as far as I can tell the IDL grammar does not allow for both. There's the prose escape-hatch of course, but that seems sad?

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https://github.com/heycam/webidl/issues/260