Rework enemy behavior (still in progress but shouldn't crash)

Zennysoft.Game.Ma.Implementation/Entity/IKnockbackable.cs

@@ -0,0 +1,9 @@
+using Godot;
+
+namespace Zennysoft.Ma.Adapter.Entity
+{
+  public interface IKnockbackable
+  {
+    void Knockback(float impulse, Vector3 direction);
+  }
+}