Update how exec/sec is displayed (#2524)

- Only display 1 digit after . for value above 1k
- Only display 2 digits after . for value above 1m

3.254k exec/sec becomes => 3.2k exec/sec
3.254M exec/sec becomes => 3.25M exec/sec

libafl/src/monitors/mod.rs

@@ -318,8 +318,11 @@ fn prettify_float(value: f64) -> String {
         value => (value, ""),
     };
     match value {
+        value if value >= 1000000.0 => {
+            format!("{value:.2}{suffix}")
+        }
         value if value >= 1000.0 => {
-            format!("{value}{suffix}")
+            format!("{value:.1}{suffix}")
         }
         value if value >= 100.0 => {
             format!("{value:.1}{suffix}")