[whatwg/dom] Add ShadowRoot clonable attribute (PR #1237)

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- [x] At least two implementers are interested (and none opposed):
   * WebKit https://github.com/whatwg/dom/issues/1236#issuecomment-1830255479
   * Blink https://github.com/whatwg/dom/issues/1236#issuecomment-1830335441
   * Seems reasonable as a Gecko person myself
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * (Will do)
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
- [ ] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. <!-- If you created this PR from a single commit, Github copied its message. Otherwise, you need to add a commit message yourself. -->

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1237

-- Commit Summary --

  * Add ShadowRoot clonable attribute

-- File Changes --

    M dom.bs (4)

-- Patch Links --

https://github.com/whatwg/dom/pull/1237.patch
https://github.com/whatwg/dom/pull/1237.diff

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