Re: [whatwg/dom] Shadow: Specify when `slotchange` fires (#447)

Definitely agree with making this change. It's much easier to create an element when the developer only has to consider one processing model for basic lifecycle.

> A well written component probably have an efficient code path for when it's constructing shadow tree instead of relying on slotchange event

One could similarly argue that `connectedCallback` should not run if the element is connected when the constructor runs because the constructor could just check `isConnected`. As with `slotchange`, this has the unfortunate effect of requiring a developer to consider multiple processing models to handle basic lifecycle. This is just fundamentally cumbersome.

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