[w3c/webcomponents] Form-associated custom elements: being a submit button (#814)

See discussion starting around https://github.com/w3c/webcomponents/issues/187#issuecomment-487168041.

If you want your FACE to be a submit button, which means:

- Can be selected by `:default`
- Can be automatically clicked by the implicit submission of other form elements

you currently cannot.

A strawperson proposal would be to add a `submitButton` boolean to `ElementInternals`. Then custom submit buttons would just do `this.#internals.submitButton = true`.

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