增加Chart的onSerieClick，onSerieDown，onSerieEnter和onSerieExit回调

Runtime/Internal/Pools/SerieEventDataPool.cs

@@ -0,0 +1,33 @@
+using UnityEngine;
+
+namespace XCharts.Runtime
+{
+    public static class SerieEventDataPool
+    {
+        private static readonly ObjectPool<SerieEventData> s_ListPool = new ObjectPool<SerieEventData>(null, OnClear);
+
+        static void OnGet(SerieEventData data)
+        {
+        }
+
+        static void OnClear(SerieEventData data)
+        {
+            data.Reset();
+        }
+
+        public static SerieEventData Get(Vector3 pos, int serieIndex, int dataIndex, int dimension, double value)
+        {
+            var data = s_ListPool.Get();
+            data.serieIndex = serieIndex;
+            data.dataIndex = dataIndex;
+            data.pointerPos = pos;
+            data.dimension = dimension;
+            return data;
+        }
+
+        public static void Release(SerieEventData toRelease)
+        {
+            s_ListPool.Release(toRelease);
+        }
+    }
+}