feat: some application of source code generator

Game/Level/LevelServices.cs.uid

@@ -0,0 +1 @@
+uid://c4pr1lc7ikb4h

Game/Root/Root.cs

@@ -1,7 +1,9 @@
+using System;
 using Godot;
 using GodotHostTest.AetherBind;
 using GodotHostTest.Interfaces;
 using OwofGames.AetherBind;
+using OwofGames.GodotLume;
 
 namespace GodotHostTest.Game.Root;
 
@@ -17,6 +19,9 @@ public partial class Root : Node2D
     {
         var levelData = _levelDataProvider.GetLevelData(_currentLevel.LevelNumber);
         AddChild(_sceneInstantiator.Instantiate(_levelScene,
-            (IValueSetter<ILevel> levelSetter) => { levelSetter.Set(levelData); }));
+            OnInstantiate(levelValueSetter => levelValueSetter.Set(levelData))));
     }
+
+    [ServiceMethod]
+    private partial Action<IProvider> OnInstantiate(Action<IValueSetter<ILevel>> a);
 }