Start the profiler Will begin sampling once this function has been called and will not stop until the `stop` function has been called. This function

Returns the profiler state # Examples ``` use cpuprofiler::PROFILER; println!("{}", PROFILER.lock().unwrap().state()); ```

Stop the profiler. This will stop the profiler if it `Active` and return an error otherwise. # Failures - The profiler is `NotActive`.