Add fetchall method to sql_db.pyi

This addition enhances the functionality of the database interface by allowing retrieval of all rows in a query result as tuples. It complements existing methods like dictfetchall and provides more options for data handling.

odoo-stubs/sql_db.pyi

@@ -51,6 +51,7 @@ class Cursor(BaseCursor):
     def dictfetchone(self) -> dict[str, Any] | None: ...
     def dictfetchmany(self, size) -> list[dict[str, Any]]: ...
     def dictfetchall(self) -> list[dict[str, Any]]: ...
+    def fetchall(self) -> list[tuple]: ...
     def __del__(self) -> None: ...
     def execute(
         self, query, params: Any | None = ..., log_exceptions: Any | None = ...