[w3c/webcomponents] Add an updated proposal for DOM Parts. (#899)

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

  https://github.com/w3c/webcomponents/pull/899

-- Commit Summary --

  * Add an updated proposal for DOM Parts.

-- File Changes --

    A proposals/DOM-Parts.md (516)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/899.patch
https://github.com/w3c/webcomponents/pull/899.diff

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