Add WinEffect class and game win functionality; implement win and game over scenes

Scripts/Core/Effects/WinEffect.cs

@@ -0,0 +1,13 @@
+using Godot;
+using ParasiticGod.Scripts.Singletons;
+
+namespace ParasiticGod.Scripts.Core.Effects;
+
+[GlobalClass]
+public partial class WinEffect : Effect
+{
+    public override void Execute(GameState gameState)
+    {
+        GameBus.Instance.NotifyGameIsWon();
+    }
+}