增加桑基图相关支持

Runtime/Component/Child/LevelStyle.cs

@@ -6,19 +6,35 @@ namespace XCharts.Runtime
     [System.Serializable]
     public class Level : ChildComponent
     {
+        [SerializeField][Since("v3.10.0")] private int m_Depth = 0;
         [SerializeField] private LabelStyle m_Label = new LabelStyle();
         [SerializeField] private LabelStyle m_UpperLabel = new LabelStyle();
+        [SerializeField][Since("v3.10.0")] private LineStyle m_LineStyle = new LineStyle();
         [SerializeField] private ItemStyle m_ItemStyle = new ItemStyle();
+
         /// <summary>
-        /// 文本标签样式。
+        /// the depth of level.
+        /// ||层级深度。 
+        /// </summary>
+        public int depth { get { return m_Depth; } set { m_Depth = value; } }
+        /// <summary>
+        /// the label style of level.
+        /// ||文本标签样式。
         /// </summary>
         public LabelStyle label { get { return m_Label; } }
         /// <summary>
-        /// 上方的文本标签样式。
+        /// the upper label style of level. 
+        /// ||上方的文本标签样式。
         /// </summary>
         public LabelStyle upperLabel { get { return m_UpperLabel; } }
         /// <summary>
-        /// 数据项样式。
+        /// the line style of level.
+        /// ||线条样式。
+        /// </summary>
+        public LineStyle lineStyle { get { return m_LineStyle; } }
+        /// <summary>
+        /// the item style of level.
+        /// ||数据项样式。
         /// </summary>
         public ItemStyle itemStyle { get { return m_ItemStyle; } }
     }