StoppedEvent should indicate whether this thread should get focus

Example: some thread hits a breakpoint, and all other threads stop. The later StoppedEvents might steal focus from the important thread, which was the first StoppedEvent

export interface StoppedEvent extends Event {
	body: {
        // ...
        threadCausedFocus?: boolean;
    }
}

cc
Mostafa Eweda (@mostafaeweda)
Eric Bluestein (@ebluestein)