[w3c/webcomponents] [idea] Lifecycle method: beforeDisconnectedCallback (#825)

I have a component that needs to affect the previous and next element siblings when it gets disconnected. However, by the time we hit `disconnectedCallback`, the element has already been removed from the DOM, so there's no context. Is there any way to do something similar to a `beforeDisconnectedCallback`, or if not would it be possible to get the method?

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