feat: Add switch container functionality

Assets/Scripts/OCES/Audio/HandWritten/LongAudio/MusicSystem.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using UnityEngine;
 
 namespace OCES.Audio
@@ -16,6 +17,11 @@ namespace OCES.Audio
         // 记录上一次两个通道各自匹配到的 PathId，用于查 Transition 表
         uint m_lastMusicPathId;
         uint m_lastAmbiencePathId;
+        
+        internal IReadOnlyDictionary<Type, Enum> ActiveStates
+        {
+            get { return this.m_stateRouter.ActiveStates; }
+        }
 
         public void Initialize(
             MusicSegmentConfig segments,