Merge pull request dotnet-architecture#1079 from dotnet-architecture/fix/1052-rabbitmq-deadlock

Fix RabbitMQ deadlock with AsyncEventingBasicConsumer consumer

Author: mvelosop

src/BuildingBlocks/EventBus/EventBusRabbitMQ/EventBusRabbitMQ.cs

@@ -274,6 +274,8 @@ private async Task ProcessEvent(string eventName, string message)
                             var handler = scope.ResolveOptional(subscription.HandlerType) as IDynamicIntegrationEventHandler;
                             if (handler == null) continue;
                             dynamic eventData = JObject.Parse(message);
+
+                            await Task.Yield();
                             await handler.Handle(eventData);
                         }
                         else
@@ -283,6 +285,8 @@ private async Task ProcessEvent(string eventName, string message)
                             var eventType = _subsManager.GetEventTypeByName(eventName);
                             var integrationEvent = JsonConvert.DeserializeObject(message, eventType);
                             var concreteType = typeof(IIntegrationEventHandler<>).MakeGenericType(eventType);
+
+                            await Task.Yield();
                             await (Task)concreteType.GetMethod("Handle").Invoke(handler, new object[] { integrationEvent });
                         }
                     }