Add attribute system with core stats and gameplay components

GameCore/Events/WeaponFiredEvent.cs

@@ -0,0 +1,11 @@
+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+using GameCore.Math;
+
+namespace GameCore.Events;
+
+public readonly struct WeaponFiredEvent(Entity owner, Vector3 muzzlePosition) : IEvent
+{
+    public readonly Entity Owner = owner;
+    public readonly Vector3 MuzzlePosition = muzzlePosition;
+}