Add foundation

Toolkit.Foundation/IPipelineBehavior.cs

@@ -0,0 +1,17 @@
+namespace Toolkit.Foundation;
+
+public interface IPipelineBehavior<TMessage, TResponse>
+    where TMessage : IMessage
+{
+    Task<TResponse> Handle(TMessage message,
+        HandlerDelegate<TMessage, TResponse> next,
+        CancellationToken cancellationToken = default);
+}
+
+public interface IPipelineBehavior<TNotification>
+    where TNotification : INotification
+{
+    Task Handle(TNotification notification,
+        NotificationHandlerDelegate<TNotification> next,
+        CancellationToken cancellationToken = default);
+}