Implement getting person CSV

from csv import DictWriter

from io import StringIO

from poolpay.model.Person import Person

def get_persons_csv() -> str:

    with StringIO() as f:

        writer = DictWriter(

            f, ["name", "cl_account_name", "balance_cents", "balance_str"]

        )

        writer.writeheader()

        writer.writerows(p.to_dict() for p in Person.get_all())

        return f.getvalue()