环境接口新增了加载项目文件路径，方便类库在Init事件中自动加载具体的依赖

Library/FlowNode/ContainerFlowEnvironment.cs

@@ -27,6 +27,7 @@ namespace Serein.Library
         public ISereinIOC IOC => sereinIOC;
 
         public string EnvName => throw new NotImplementedException();
+        public string ProjectFileLocation => throw new NotImplementedException();
 
         public bool IsGlobalInterrupt => throw new NotImplementedException();