fix(bindings/python): add blocking client related to pyi

bindings/python/package/databend_driver/__init__.pyi

@@ -72,3 +72,15 @@ class AsyncDatabendConnection:
 class AsyncDatabendClient:
     def __init__(self, dsn: str): ...
     async def get_conn(self) -> AsyncDatabendConnection: ...
+
+class BlockingDatabendConnection:
+    def info(self) -> ConnectionInfo: ...
+    def version(self) -> str: ...
+    def exec(self, sql: str) -> int: ...
+    def query_row(self, sql: str) -> Row: ...
+    def query_iter(self, sql: str) -> RowIterator: ...
+    def stream_load(self, sql: str, data: list[list[str]]) -> ServerStats: ...
+
+class BlockingDatabendClient:
+    def __init__(self, dsn: str): ...
+    def get_conn(self) -> BlockingDatabendConnection: ...