lateinit var coroutineScope: CoroutineScope
The lifespan of this Synchronizer. This scope is initialized once the Synchronizer starts because it will be a child of the parentScope that gets passed into the start function. Everything launched by this Synchronizer will be cancelled once the Synchronizer or its parentScope stops. This is a lateinit rather than nullable property so that it fails early rather than silently, whenever the scope is used before the Synchronizer has been started.