refactor: The first refactored version for sdk release (#907)

Co-authored-by: chengfangyin2 <chengfangyin3@jd.com>

dbgpt/app/openapi/base.py

@@ -0,0 +1,10 @@
+from fastapi import Request
+from fastapi.exceptions import RequestValidationError
+from dbgpt.app.openapi.api_view_model import Result
+
+
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+    message = ""
+    for error in exc.errors():
+        message += ".".join(error.get("loc")) + ":" + error.get("msg") + ";"
+    return Result.failed(code="E0001", msg=message)