feat: fully functional CLI and Avalonia UI for Snake game

Snake.CLI/Program.cs

@@ -3,7 +3,7 @@ using Snake.Core;
 
 const int boardWidth = 20;
 const int boardHeight = 15;
-const int tickMs = 120;
+const int baseTickMs = 120;
 
 SnakeGame game = new(boardWidth, boardHeight);
 ConsoleRenderer.Render(game);
@@ -40,5 +40,5 @@ while (true)
         game.Tick();
 
     ConsoleRenderer.Render(game);
-    Thread.Sleep(tickMs);
+    Thread.Sleep(SnakeGame.GetTickIntervalMs(game.Score, baseTickMs));
 }