feat(minor): `SQLChatAgent` - use `make_sql_task(use_helper=True)` to have a helper agent disambiguate when main agent forgets to use a tool.
- [test](https://github.com/langroid/langroid/blob/main/tests/main/sql_chat/test_sql_chat_agent.py)
- [example](https://github.com/langroid/langroid/blob/main/examples/data-qa/sql-chat/sql_chat.py)
Also includes a fix to `Task.response_async` where we add some calls to `try_get_tool_messages` to match `response` method.