Re: [WICG/webcomponents] Interaction between ElementInternals (e.g. default ARIA) and declarative shadow DOM (Issue #972)

There are a few solutions to consider here.

1. Put ARIA on `template` element and automatically transfer them to `ElementInternals`. This is a bit strange since we'd be special-casing ARIA on template elements then.
2. Introduce new shadowaria* or defaultaria* content attributes. e.g. shadowarialabel="blah" or defaultarialabel="blah" would translate to setting ariaLabel to "blah" in `ElementInternals`.
3. "elementinternals" content attribute with its own micro-syntax for serializing `ElementInternals`. e.g. `elementinternals="role='checkbox' ariaLabel='blah'"` or `elementinternals='{"role": "checkbox", "ariaLabel": "blah"}'`.

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