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

Scripts/Core/Effects/WinEffect.cs

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+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();
+    }
+}

Scripts/Core/Effects/WinEffect.cs.uid

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+uid://77fa2htfghwy