 `async_process(req, resp, next)` method is supposed to be invoked only inside bolt-python.
        If you want to avoid the name `next()` in your middleware functions, you can use `next_()` method instead.

            @app.middleware
            async def simple_middleware(req, resp, next_):
                # do something here
                await next_()

        Args:
            req: The incoming request
            resp: The response
            next: The function to tell the chain that it can contin