Add parameters to fetch_all() or fetch_one() to specify which attributes we want

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For some optimisations (speed, debit or memory), Is it possible to specify which attributes we want to get when calling gazu.client.fetch_all() or gazu.client.fetch_one() ?

For instance, if I want to get all users but only to manipulate their names, I would make a request by specifying "first_name" and "last_name" in option to minimize the data to request.

Thanks in advance !