Add built-in way to have the profiler "wait" for X amount of time

When using the self-profiling API, it would be useful if there was a built-in way to have the profiler wait, after being started, for X amount of time without having to use something like `await Task.Delay()` or `Thread.Sleep`. This causes that "wait" to usually blow out the rest of the graph, making it not as useful for quick glances to determine bottlenecks. While I can remove that method from the viewer, it'd be ideal for it to not have to be there in the first place.