[w3c/webcomponents] Synthetic click activation steps should state whether the event is composed or not (#578)

To [run synthetic click activation steps](https://html.spec.whatwg.org/#run-synthetic-click-activation-steps) or more broadly the definition of [firing a `click` event](https://html.spec.whatwg.org/#fire-a-click-event) should clarify when if ever the event is fired with [`composed` flag]() set to true.

Also, the definition of [initializing an event](https://dom.spec.whatwg.org/#concept-event-initialize) should take *composed* as an argument.

As things stand, the specifications are extremely unclear about when & how this flag is set.

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