feat: Support CSV download for table data

[OmarIthawi]

Mostly concerning the tenant-wide list of learners at the moment.

We need to evaluate its priority, but the request has been made a couple of times already.

• https://docs.google.com/spreadsheets/d/1Zz0fA4HJgRSn5yJSnHtB933e6TeVWBQayDb_WIwLLKY/edit?gid=0#gid=0

[shadinaif]

closing in favor of https://github.com/nelc/futurex-openedx-extensions/issues/62