toLiveData
fun <T> Publisher<T>.toLiveData(resubscribe: Boolean, stopOn: Lifecycle.Event = Lifecycle.Event.ON_DESTROY): LiveData<T>
fun <T> Observable<T>.toLiveData(resubscribe: Boolean, stopOn: Lifecycle.Event = Lifecycle.Event.ON_DESTROY, backpressureStrategy: BackpressureStrategy = BackpressureStrategy.BUFFER): LiveData<T>