Display min value when running runtime benchmarks locally

The mean is, despite my best efforts, often quite noisy, and we will probably display the min in the frontend anyway, so it should be the "default" value for gauging changes in benchmarks.

Author: Kobzol

collector/src/runtime/mod.rs

@@ -221,9 +221,11 @@ fn print_stats(result: &BenchmarkResult) {
                     .map(|v| (v as f64 - mean).powf(2.0)),
             )
             .sqrt();
+            let min = result.stats.iter().map(&f).min().unwrap_or(0);
 
             println!(
-                "{name:>18}: {:>16} (+/- {:>11})",
+                "{name:>18}: min:{:>16}    mean: {:>16}    stddev: {:>11}",
+                min.separate_with_commas(),
                 (mean as u64).separate_with_commas(),
                 (stddev as u64).separate_with_commas()
             );