[w3c/webcomponents] Add Declarative Shadow DOM strawman proposal (#731)

I'm not sure if it's the right process, but I'd like to publish Declarative Shadow DOM proposal. To move forward the discussions from https://github.com/whatwg/dom/issues/510 and https://discourse.wicg.io/t/declarative-shadow-dom/1904/15

The single list is definitely not the best way to describe behavior specifications, but:
- I'm not sure what would be the best format of the actual normative document,
- I'd like to keep the high-level characteristics and implications readable for humans, not to get into precise strict algorithms
- Once we will reach consensus about some high-level behavior, I'd be happy to write something more detailed.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/731

-- Commit Summary --

  * Add Declarative Shadow DOM strawman proposal

-- File Changes --

    A proposals/Declarative-Shadow-DOM.md (317)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/731.patch
https://github.com/w3c/webcomponents/pull/731.diff

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