Added randomization states

com.unity.perception/Runtime/Randomization/Randomizers/Randomizer.cs

         /// </summary>
         protected virtual void OnScenarioComplete() { }
 
+        protected virtual void OnScenarioStart() { }
+
         /// <summary>
         /// OnStartRunning is called on the first frame a Randomizer is enabled
         /// </summary>
         /// </summary>
         protected virtual void OnUpdate() { }
 
+        public virtual void OnDrawGizmos() { }
+
         internal virtual void Create()
         {
             OnCreate();
         internal virtual void IterationEnd()
         {
             OnIterationEnd();
+        }
+
+        internal virtual void ScenarioStart()
+        {
+            OnScenarioStart();
         }
 
         internal virtual void ScenarioComplete()

com.unity.perception/Runtime/Randomization/Scenarios/ScenarioBase.cs

                 Debug.Log($"No configuration file found at {defaultConfigFilePath}. " +
                     "Proceeding with built in scenario constants and randomizer settings.");
 #endif
+
+            foreach (var randomizer in activeRandomizers)
+                randomizer.ScenarioStart();
         }
 
         struct IterationMetricData
             // Perform new frame tasks
             foreach (var randomizer in activeRandomizers)
                 randomizer.Update();
+        }
+
+        void OnDrawGizmos()
+        {
+            foreach (var randomizer in activeRandomizers)
+            {
+                randomizer.OnDrawGizmos();
+            }
         }
 
         /// <summary>