private static Object manageTimerInitialization(Callable<?> callable) throws Exception {
        attemptToStartTimer();
        return callable.call();
    }
Helper object for seeing if current method was the first one to call finish on the scenario,
so we can stop the timer at the very last step.
jgiven-timing/src/main/java/com/tngtech/jgiven/timing/ManageTimerInterceptor.java