CPU Profiler auto stop timer [Improvement]

Suggestion to add a customizable automatic stop for a specified number of seconds.

I spent several days optimizing the speed of the library on Dart. To compare two states before and after, you need to measure at the same time interval. I had to additionally use a timer app to record roughly 10 second sections. During optimization, this operation has to be done hundreds of times. It would be more convenient to have an input field next to the Stop button indicating the number of seconds before automatic stop.