Added separate EventManger for FixedUpdate.

Runtime/PhysicsEventManager.cs

@@ -0,0 +1,21 @@
+using System;
+using UnityEngine;
+
+namespace Utils
+{
+    public class PhysicsEventManager : MonoBehaviour
+    {
+        public delegate void FixedUpdateAction();
+
+        public static event FixedUpdateAction FixedUpdated;
+
+        private void FixedUpdate()
+        {
+            FixedUpdated?.Invoke();
+        }
+
+        public static Delegate[] FixedUpdateDelegates => FixedUpdated?.GetInvocationList();
+
+        public static int FixedUpdateLength => FixedUpdateDelegates?.Length ?? 0;
+    }
+}