Re: [whatwg/dom] Allow elements with a null customElementRegistry without Shadow DOM (Issue #1413)

ja-y-son left a comment (whatwg/dom#1413)

After discussing at TPAC, we agreed that we will make the following spec changes (separately) to support element with a null custom element registry without shadow dom:
- Insert steps no longer set registry to null registry element and adopt steps will set global registry to null registry element.
- Add an element attribute to declarative set null registry to the given element and subtree
- Add imperative null registry creation option to `document.createElement` and `attachShadow`

The first one is shipping-critical as it's a non-backwards compatible change. The second and third are additive to the spec.
I will drive the spec change with @sorvell on these changes. Let me know if I captured anything above incorrectly.

cc @annevk @rniwa @justinfagnani @leotlee 

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