feat: update Godot integration and coordinated package dependencies

Runtime/ShrinkRuntimeServices.cs

@@ -21,6 +21,11 @@ namespace ShrinkSDK.Runtime
         bool TryPost(Action action);
     }
 
+    public interface IShrinkDeferredMainThreadDispatcher
+    {
+        bool TryPostDeferred(Action action);
+    }
+
     public interface IShrinkClock
     {
         DateTimeOffset UtcNow { get; }