Function timeout

src/rpp/rpp/operators/timeout.hpp:207–210

     */
    template<rpp::constraint::observable TFallbackObservable, rpp::schedulers::constraint::scheduler TScheduler>
    auto timeout(rpp::schedulers::duration period, TFallbackObservable&& fallback_observable, const TScheduler& scheduler)
    {
        return details::timeout_t<std::decay_t<TFallbackObservable>, TScheduler>{period, std::forward<TFallbackObservable>(fallback_observable), scheduler};
    }

    /**
     * @brief Forwards emissions from original observable, but emit error if no any events during specified period of time (since last emission)