Re: [WICG/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

Not to add too much noise here, but if the consensus is that this _cannot_ be parser specific then I just want to point out hydration as a motivating use case (which I don't see in this thread?)

I think there is a lot of value in being able to write "when this component is fully parsed, hydrate it". That inherently needs to be a parser feature, since hydration would be unrelated to any mutations applied to the element mid-parse. This is especially important for streaming use cases and is technically necessary anytime you hydrate a component defined in an async script tag, since it may execute while the document is mid-parse of a hydratable element.

I just wanted to point out hydration as one use case which would really benefit from a parser notification here and I don't think any non-parser approach like `MutationOberserver` meets that need.

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