[w3c/webcomponents] Add custom states and :state() pseudo class proposal (#832)

A proposal for custom states on custom element (and a corresponding pseudo class selector).
This is mostly a summary of discussions in https://github.com/w3c/webcomponents/issues/738.

cc most people in that thread @domenic @tkent-google @annevk @rniwa @othermaciej @JanMiksovsky 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/832

-- Commit Summary --

  * Add custom states and :state() pseudo class proposal

-- File Changes --

    A proposals/custom-states-and-state-pseudo-class.md (105)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/832.patch
https://github.com/w3c/webcomponents/pull/832.diff

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https://github.com/w3c/webcomponents/pull/832