replace rag llm factory with llamaindex custom llm

metagpt/utils/async_helper.py

@@ -0,0 +1,22 @@
+import asyncio
+import threading
+from typing import Any
+
+
+def run_coroutine_in_new_loop(coroutine) -> Any:
+    """Runs a coroutine in a new, separate event loop on a different thread.
+
+    This function is useful when try to execute an async function within a sync function, but encounter the error `RuntimeError: This event loop is already running`.
+    """
+    new_loop = asyncio.new_event_loop()
+    t = threading.Thread(target=lambda: new_loop.run_forever())
+    t.start()
+
+    future = asyncio.run_coroutine_threadsafe(coroutine, new_loop)
+
+    try:
+        return future.result()
+    finally:
+        new_loop.call_soon_threadsafe(new_loop.stop)
+        t.join()
+        new_loop.close()