prevent WorkflowInstanceIdFactory to be instantiated when is no necessary

Signed-off-by: Matheus Cruz <[email protected]>

Author: mcruzdev

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

@@ -140,7 +140,7 @@ public SchemaValidator getValidator(SchemaInline inline) {
     private ResourceLoaderFactory resourceLoaderFactory = DefaultResourceLoaderFactory.get();
     private SchemaValidatorFactory schemaValidatorFactory;
     private WorkflowPositionFactory positionFactory = () -> new QueueWorkflowPosition();
-    private WorkflowInstanceIdFactory idFactory = new MonotonicUlidWorkflowInstanceIdFactory();
+    private WorkflowInstanceIdFactory idFactory;
     private ExecutorServiceFactory executorFactory = new DefaultExecutorServiceFactory();
     private EventConsumer<?, ?> eventConsumer;
     private Collection<EventPublisher> eventPublishers = new ArrayList<>();
@@ -243,6 +243,9 @@ public WorkflowApplication build() {
                       return inMemory;
                     });
       }
+      if (idFactory == null) {
+          idFactory = new MonotonicUlidWorkflowInstanceIdFactory();
+      }
       return new WorkflowApplication(this);
     }
   }