Fix NotSupportedException during delegate marshaling in IL2CPP

[kisielewski]

The application throws a NotSupportedException because IL2CPP does not support marshaling delegates that point to instance methods to native code. This occurs when passing lambda expressions or non-static methods as callbacks to native plugins. To resolve this, all affected delegates must be converted to static methods. The object instance should be passed to the native side as an IntPtr context (using GCHandle) and retrieved within the static callback to invoke the necessary instance logic.