Feature Request: Provide for a way to populate time zone tables

[Meai]

Problem:
This returns null after cluster creation: SELECT CONVERT_TZ(NOW(), '+00:00', 'UTC');

So usually I would fix it by running this: mysql_tzinfo_to_sql /usr/share/zoneinfo | mysql -u root -p mysql but there is no way to do this in the vitess operator. I think it would have to run after mysql_install_db and before init_db.sql

Goal:
I would like to be able to put default-time-zone='UTC' into my [mysqld] configOverrides, not just default_time_zone = '+00:00'