feat: Add FPS toggle shortcut and corresponding input handling in CLI

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

apps/wolf_3d_cli/lib/cli_game_loop.dart

@@ -162,6 +162,13 @@ class CliGameLoop {
       return;
     }
 
+    if (input.matchesFpsToggleShortcut(bytes)) {
+      engine.toggleFpsCounter();
+      _syncRendererFromEngine();
+      unawaited(persistence?.save(engine.rendererSettings));
+      return;
+    }
+
     input.handleKey(bytes);
   }