[WICG/webcomponents] Provide a mechanism to prevent or coalesce upgrades when defining new custom elements (#922)

From https://github.com/WICG/webcomponents/issues/710, we should provide a mechanism to prevent automatic upgrades when defining a new custom element so that we'll end up with more predictable upgrading order & avoid O(nk) runtime cost of iterating over n DOM nodes for k custom elements.

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