Fill users emails to MySQL.
Steps:
* Get user_id to email mapping from Auth0 using export endpoint.
* Upsert the mapping to MySQL.

Use:
python3 main.py %args%

Arguments:
--domain - Auth0 domain
--client_id - Auth0 M2M client ID
--client_secret - Auth0 M2M client secret
--connection_id - Auth0 database connection ID list
--host - MySQL host URL/IP
--post - MySQL port (default=3306)
--name - MySQL database name
--user - MySQL username
--password - MySQL password
--batch - MySQL insert/update batch size (default=100)