Feature/newnew workflow loop node (#14863)

Co-authored-by: arkunzz <4873204@qq.com>

api/core/workflow/nodes/base/__init__.py

@@ -1,4 +1,11 @@
-from .entities import BaseIterationNodeData, BaseIterationState, BaseNodeData
+from .entities import BaseIterationNodeData, BaseIterationState, BaseLoopNodeData, BaseLoopState, BaseNodeData
 from .node import BaseNode
 
-__all__ = ["BaseIterationNodeData", "BaseIterationState", "BaseNode", "BaseNodeData"]
+__all__ = [
+    "BaseIterationNodeData",
+    "BaseIterationState",
+    "BaseLoopNodeData",
+    "BaseLoopState",
+    "BaseNode",
+    "BaseNodeData",
+]

api/core/workflow/nodes/base/entities.py

@@ -147,3 +147,18 @@ class BaseIterationState(BaseModel):
         pass
 
     metadata: MetaData
+
+
+class BaseLoopNodeData(BaseNodeData):
+    start_node_id: Optional[str] = None
+
+
+class BaseLoopState(BaseModel):
+    loop_node_id: str
+    index: int
+    inputs: dict
+
+    class MetaData(BaseModel):
+        pass
+
+    metadata: MetaData