Re: [w3c/webcomponents] Custom pseudo-classes for host elements via shadow roots (:state) (#738)

Form-associated custom elements discussed in https://github.com/w3c/webcomponents/issues/187 doesn't provide a way to match an element with form-related built-in pseudo classes (*1).  I'd like to extend  the API for them.

Assume that the current API is like:

    this.#internals = this.attachInternals();
    this.#internals.states.add('foo');  // this element matches to custom state 'foo'

I'd like to extend ```states``` to accept the built-in pseudo classes.

    this.#internals.states.add(':checked');  // this element matches to :checked.

*1)  :checked, :indeterminate, :default, :in-range, :out-of-range, :required, :optional, :read-only, :read-write

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