Add benchmark support using -b

Days/Day8.cs

@@ -6,7 +6,7 @@ public class Day8 : Day
 {
     public override int Number => 8;
     public override string Name => "Treetop Tree House";
-    public override void RunPart1()
+    public override void RunPart1(bool display = true)
     {
         var grid = CreateGrid();
 
@@ -92,10 +92,14 @@ public class Day8 : Day
             }
         }
 
-        AnsiConsole.MarkupLine($"[green]Total viewable trees: [yellow]{valid.Count}[/][/]");
+
+        if (display)
+        {
+            AnsiConsole.MarkupLine($"[green]Total viewable trees: [yellow]{valid.Count}[/][/]");
+        }
     }
 
-    public override void RunPart2()
+    public override void RunPart2(bool display = true)
     {
         var grid = CreateGrid();
 
@@ -116,7 +120,10 @@ public class Day8 : Day
             }
         }
 
-        AnsiConsole.MarkupLine($"[green]Max scenic score: [yellow]{maxScenicScore}[/][/]");
+        if (display)
+        {
+            AnsiConsole.MarkupLine($"[green]Max scenic score: [yellow]{maxScenicScore}[/][/]");
+        }
     }
 
     private int ComputeScenicScore(int[,] grid, int i, int j, int size)