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

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

dbgpt/datasource/db_conn_info.py

@@ -0,0 +1,17 @@
+from dbgpt._private.pydantic import BaseModel, Field
+
+
+class DBConfig(BaseModel):
+    db_type: str
+    db_name: str
+    file_path: str = ""
+    db_host: str = ""
+    db_port: int = 0
+    db_user: str = ""
+    db_pwd: str = ""
+    comment: str = ""
+
+
+class DbTypeInfo(BaseModel):
+    db_type: str
+    is_file_db: bool = False