feat(rag): Support RAG SDK (#1322)

dbgpt/datasource/__init__.py

@@ -1,6 +1,17 @@
 """Module to define the data source connectors."""
 
+from typing import Any
+
 from .base import BaseConnector  # noqa: F401
-from .rdbms.base import RDBMSConnector  # noqa: F401
+
+
+def __getattr__(name: str) -> Any:
+    if name == "RDBMSConnector":
+        from .rdbms.base import RDBMSConnector  # noqa: F401
+
+        return RDBMSConnector
+    else:
+        raise AttributeError(f"Could not find: {name} in datasource")
+
 
 __ALL__ = ["BaseConnector", "RDBMSConnector"]