[whatwg/dom] Allow 'lower-boundary' scoping argument in querySelector() (Issue #1172)

The CSSWG is working on new 'scoping' functionality, that allows authors to establish both upper (root) and lower boundaries on a 'scoped' selector. The result is that selectors match within a tree fragment starting at the root, and containing all descendants up until a lower boundary selector is matched.

It would be great to have this option available for authors in `querySelector()` as well. In [our discussions](https://github.com/w3c/csswg-drafts/issues/7709), @tabatkins [suggested the following](https://github.com/w3c/csswg-drafts/issues/7709#issuecomment-1239930505):

> In particular, the current second argument to qS() is, effectively, the upper bound of scoping; we could expand the argument to be an options bag with `{upper: [nodes], lower: [nodes]}` to accommodate both directions.

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