feat(core): More AWEL operators and new prompt manager API (#972)

Co-authored-by: csunny <cfqsunny@163.com>

dbgpt/serve/prompt/api/schemas.py

@@ -1,6 +1,8 @@
 # Define your Pydantic schemas here
 from typing import Optional
+
 from dbgpt._private.pydantic import BaseModel, Field
+
 from ..config import SERVE_APP_NAME_HUMP