增加Chart的onSerieClick，onSerieDown，onSerieEnter和onSerieExit回调

Runtime/Internal/Misc/SerieEventData.cs

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+using UnityEngine;
+
+namespace XCharts.Runtime
+{
+    /// <summary>
+    /// the data of serie event.
+    /// |serie事件的数据。
+    /// </summary>
+    public class SerieEventData
+    {
+        /// <summary>
+        /// the position of pointer in chart.
+        /// |鼠标在chart中的位置。
+        /// </summary>
+        public Vector3 pointerPos { get; set; }
+        /// <summary>
+        /// the index of serie in chart.series.
+        /// |在chart.series中的索引。
+        /// </summary>
+        public int serieIndex { get; set; }
+        /// <summary>
+        /// the index of data in serie.data.
+        /// |在serie.data中的索引。
+        /// </summary>
+        public int dataIndex { get; set; }
+        /// <summary>
+        /// the dimension of data.
+        /// |数据的维度。
+        /// </summary>
+        public int dimension { get; set; }
+        /// <summary>
+        /// the value of data.
+        /// |数据的值。
+        /// </summary>
+        public double value { get; set; }
+
+        public void Reset()
+        {
+            serieIndex = -1;
+            dataIndex = -1;
+            dimension = -1;
+            value = 0;
+            pointerPos = Vector3.zero;
+        }
+    }
+}

Runtime/Internal/Misc/SerieEventData.cs.meta

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