feat: Parallel Execution of Nodes in Workflows (#8192)

Co-authored-by: StyleZhang <jasonapring2015@outlook.com>
Co-authored-by: Yi <yxiaoisme@gmail.com>
Co-authored-by: -LAN- <laipz8200@outlook.com>

api/core/tools/tool_engine.py

@@ -128,6 +128,7 @@ class ToolEngine:
                         user_id: str,
                         workflow_tool_callback: DifyWorkflowCallbackHandler,
                         workflow_call_depth: int,
+                        thread_pool_id: Optional[str] = None
                         ) -> list[ToolInvokeMessage]:
         """
         Workflow invokes the tool with the given arguments.
@@ -141,6 +142,7 @@ class ToolEngine:
 
             if isinstance(tool, WorkflowTool):
                 tool.workflow_call_depth = workflow_call_depth + 1
+                tool.thread_pool_id = thread_pool_id
 
             if tool.runtime and tool.runtime.runtime_parameters:
                 tool_parameters = {**tool.runtime.runtime_parameters, **tool_parameters}