Implement health modification on enemy kill; add HealOnKillModifier and update death behavior

Assets/Scripts/Interfaces/IDeathBehavior.cs

@@ -1,7 +1,10 @@
+using JetBrains.Annotations;
+using UnityEngine;
+
 namespace Interfaces
 {
     public interface IDeathBehavior
     {
-        void Die();
+        void Die([CanBeNull] GameObject killer = null);
     }
 }

Assets/Scripts/Interfaces/IOnKillEffect.cs

@@ -0,0 +1,9 @@
+using UnityEngine;
+
+namespace Interfaces
+{
+    public interface IOnKillEffect
+    {
+        void OnKill(GameObject killer, GameObject victim);
+    }
+}

Assets/Scripts/Interfaces/IOnKillEffect.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 3237e2bd7db84674bd34467854e53928
+timeCreated: 1752314256