Add skill upgrade system and refactor skill components for enhanced functionality; update resource paths and configurations

scripts/interfaces/ISkill.cs

@@ -1,11 +1,13 @@
 using Godot;
+using Mr.BrickAdventures.scripts.Resources;
 
 namespace Mr.BrickAdventures.scripts.interfaces;
 
 public interface ISkill
 {
-    void Initialize(Node owner);
+    void Initialize(Node owner, SkillData data);
     
     void Activate();
     void Deactivate();
+    void ApplyUpgrade(SkillUpgrade upgrade);
 }