Add support for event tasks

[boma96]

[WorkflowMetadata(OwnerEmail="test@test.com")]publicclassEventTaskWorkflow:Workflow<EventTaskWorkflow,EventTaskWorkflowInput,EventTaskWorkflowOutput>{publicclassEventTaskPayload:IRequest<EventTaskModelOutput>{publicstringPayloadParam{get;set;}}publicEventTaskModel<EventTaskPayload>EventTask{get;set;}publicEventTaskWorkflow(WorkflowDefinitionBuilder<EventTaskWorkflow,EventTaskWorkflowInput,EventTaskWorkflowOutput>builder):base(builder){}publicoverridevoidBuildDefinition(){_builder.AddTask(wf =>wf.EventTask, wf =>new(){PayloadParam="param"},"conductor:event");}}