feat: Adding FlameConsole (#3329)

Adding Flame Console package.

---------

Co-authored-by: Lukas Klingsbo <me@lukas.fyi>

packages/flame_console/example/lib/main.dart

@@ -0,0 +1,50 @@
+import 'package:flame/game.dart';
+import 'package:flame_console/flame_console.dart';
+import 'package:flame_console_example/game.dart';
+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(const MaterialApp(home: MyGameApp()));
+}
+
+class MyGameApp extends StatefulWidget {
+  const MyGameApp({super.key});
+
+  @override
+  State<MyGameApp> createState() => _MyGameAppState();
+}
+
+class _MyGameAppState extends State<MyGameApp> {
+  late final MyGame _game;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _game = MyGame();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: GameWidget(
+        game: _game,
+        overlayBuilderMap: {
+          'console': (BuildContext context, MyGame game) => ConsoleView(
+                game: game,
+                onClose: () {
+                  _game.overlays.remove('console');
+                },
+              ),
+        },
+      ),
+      floatingActionButton: FloatingActionButton(
+        heroTag: 'console_button',
+        onPressed: () {
+          _game.overlays.add('console');
+        },
+        child: const Icon(Icons.developer_mode),
+      ),
+    );
+  }
+}