[whatwg/dom] Add DOMParser option to parse declarative shadow DOM (Issue #1145)

I'm splitting this out from the discussion that starts on this comment https://github.com/whatwg/html/pull/5465#discussion_r1042020381 and then jumps to overall issue comments starting here https://github.com/whatwg/html/pull/5465#issuecomment-1383927052. This was also previously discussed at length starting at this comment https://github.com/whatwg/dom/issues/912#issuecomment-725900521. That issue has much more context on why there needs to be an opt-in for DSD at all.

The [current spec PR](https://github.com/whatwg/html/pull/5465) has `DOMParser.parseFromString(html,"text/html", {declarativeShadowRoots: true})` which is the *only* API that lets you imperatively parse HTML that contains declarative shadow roots.

There is a question about whether we need to add this, and whether instead we should make Sanitizer's `setHTML()` the only DSD-aware parser API. That requires some changes to the Sanitizer (https://github.com/whatwg/html/issues/8627), in particular giving `setHTML()` a `sanitizer: "unsafe-none"` argument that bypasses all sanitization.


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