feat(job): Make query pagination an async stream

[LiHRaM]

I've thought a bit about how we can make the pagination more flexible for diverse usecases, and I'm sure people want to handle possible errors differently, so I suggest we go with something á la the following to make that possible:

The pagination becomes an asynchronous iterator over Result<Vec<TableRow>, BQError>. People are then able to stream through very large results without exhausting memory, and can use collect and flatten to imitate the previous implementation.

[lquerel]

Agree. Thanks for this improvement. I will publish soon a new release with this update.