Add benchmark support using -b

Days/Day9.cs

@@ -7,7 +7,7 @@ public class Day9 : Day
     public override int Number => 9;
     public override string Name => "Rope Bridge";
 
-    public override void RunPart1()
+    public override void RunPart1(bool display = true)
     {
         // Start
         (int x, int y) start = (0, 0);
@@ -49,10 +49,13 @@ public class Day9 : Day
             }
         }
 
-        AnsiConsole.MarkupLine($"[green]The tail visited [yellow]{tailVisitedPositions.Count}[/] unique positions[/]");
+        if (display)
+        {
+            AnsiConsole.MarkupLine($"[green]The tail visited [yellow]{tailVisitedPositions.Count}[/] unique positions[/]");
+        }
     }
 
-    public override void RunPart2()
+    public override void RunPart2(bool display = true)
     {
         const int tailSegments = 9;
 
@@ -130,7 +133,10 @@ public class Day9 : Day
             }
         }
 
-        AnsiConsole.MarkupLine($"[green]The tail visited [yellow]{tailVisitedPositions.Count}[/] unique positions[/]");
+        if (display)
+        {
+            AnsiConsole.MarkupLine($"[green]The tail visited [yellow]{tailVisitedPositions.Count}[/] unique positions[/]");
+        }
     }
 
     #region Input