Re: [w3c/webcomponents] Consider adding a childrenChangedCallback or something (#619)

@rektide `slotchange` is already a thing. More details in the [DOM standard mutation observers section](https://dom.spec.whatwg.org/#mutation-observers) and the [Shadow DOM spec](https://www.w3.org/TR/shadow-dom/#signaling-slot-change).

That issue in Skate was just a reference for a more specific implementation we were spiking that is related to the same use-cases that a `childrenChangedCallback` would solve. I was hoping that it could serve as proof where an abstract such as this callback could prove very useful. I don't feel it's detracted from this discussion.

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