Move output from WorkflowInstanceData to WorkflowInstance (#1358)

Signed-off-by: fjtirado <ftirados@redhat.com>

Author: fjtirado

impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowInstance.java

@@ -20,6 +20,10 @@
 public interface WorkflowInstance extends WorkflowInstanceData {
   CompletableFuture<WorkflowModel> start();
 
+  WorkflowModel output();
+
+  <T> T outputAs(Class<T> clazz);
+
   boolean suspend();
 
   boolean cancel();

impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowInstanceData.java

@@ -28,9 +28,5 @@ public interface WorkflowInstanceData {
 
   WorkflowStatus status();
 
-  WorkflowModel output();
-
   WorkflowModel context();
-
-  <T> T outputAs(Class<T> clazz);
 }