Re: [w3c/webcomponents] Add Scoped CustomElementRegsitry explainer (#865)

I was thinking the global one could do shadow trees with their own registry more quickly, but it depends a bit on nested shadow trees and might require more bookkeeping than it's worth. It does seem like you want that to be fast as well though since not all elements will be nested in a shadow tree.

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If a registry is bound to a document and you move a shadow root associated with a registry to another document, I would assume we want that shadow root to lose its connection to the registry. I suppose we could also make a bunch of things no longer work, but either way you should be able to recover from that I think (by associating the shadow root with an equivalent registry for that document). For elements we offer `adoptedCallback`, for shadow roots we don't have such a thing. So either we'd add something to shadow roots or we tightly couple these kind of shadow roots (that have a custom registry) to elements that can have custom internals.

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