重构了运行逻辑。上下文使用对象池封装，节点方法调用时间传递CancellationTokenSource用来中止任务

Library/NodeStaticConfig.cs

@@ -9,16 +9,6 @@ namespace Serein.Library
 {
     public static class NodeStaticConfig
     {
-        /// <summary>
-        /// 全局触发器CTS
-        /// </summary>
-        public const string FlipFlopCtsName = "$FlowFlipFlopCts";
-        /// <summary>
-        /// 流程运行CTS
-        /// </summary>
-        public const string FlowRungCtsName = "$FlowRungCtsName";
-
-
         /// <summary>
         /// 节点的命名空间
         /// </summary>