[whatwg/dom] Introduce `moveBefore()` state-preserving atomic move API (PR #1307)

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<a href="https://whatpr.org/dom/1307.html" title="Last updated on Aug 26, 2024, 6:09 PM UTC (1b2ec1c)">Preview</a> | <a href="https://whatpr.org/dom/1307/7c494e5...1b2ec1c.html" title="Last updated on Aug 26, 2024, 6:09 PM UTC (1b2ec1c)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1307

-- Commit Summary --

  * Initial atomic move skeleton
  * Most of the `MutationObserver` integration
  * Remove mutation events flag references
  * Populate the `MutationRecord`

-- File Changes --

    M dom.bs (107)

-- Patch Links --

https://github.com/whatwg/dom/pull/1307.patch
https://github.com/whatwg/dom/pull/1307.diff

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