feat: automatic injection of elements in scene.

Game/LevelServiceSource.cs

@@ -0,0 +1,18 @@
+using Godot;
+using GodotHostTest.GodotDI;
+using GodotHostTest.Interfaces;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace GodotHostTest.Game;
+
+public partial class LevelServiceSource : RootServiceSource
+{
+    [Export] private TargetSpawner _targetSpawner = null!;
+
+    protected override void Configure(IServiceCollection serviceCollection)
+    {
+        serviceCollection
+            .AddSingleton<ITargetCollector>(_targetSpawner)
+            .AddSingleton<ITargetSpawner>(_targetSpawner);
+    }
+}