feat: llm text stream support for workflow app (#3798)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/core/app/entities/task_entities.py

@@ -9,9 +9,17 @@ from core.workflow.entities.node_entities import NodeType
 from core.workflow.nodes.answer.entities import GenerateRouteChunk
 
 
-class StreamGenerateRoute(BaseModel):
+class WorkflowStreamGenerateNodes(BaseModel):
     """
-    StreamGenerateRoute entity
+    WorkflowStreamGenerateNodes entity
+    """
+    end_node_id: str
+    stream_node_ids: list[str]
+
+
+class ChatflowStreamGenerateRoute(BaseModel):
+    """
+    ChatflowStreamGenerateRoute entity
     """
     answer_node_id: str
     generate_route: list[GenerateRouteChunk]
@@ -55,6 +63,8 @@ class WorkflowTaskState(TaskState):
     ran_node_execution_infos: dict[str, NodeExecutionInfo] = {}
     latest_node_execution_info: Optional[NodeExecutionInfo] = None
 
+    current_stream_generate_state: Optional[WorkflowStreamGenerateNodes] = None
+
 
 class AdvancedChatTaskState(WorkflowTaskState):
     """
@@ -62,7 +72,7 @@ class AdvancedChatTaskState(WorkflowTaskState):
     """
     usage: LLMUsage
 
-    current_stream_generate_state: Optional[StreamGenerateRoute] = None
+    current_stream_generate_state: Optional[ChatflowStreamGenerateRoute] = None
 
 
 class StreamEvent(Enum):