Add ability to create a note for users (also when blocking them)

• Customer / Requester: Big Consumer Electronics Company
• Zendesk ticket: https://gitlab.zendesk.com/agent/tickets/7853

Requested feature

It would be very useful to be able to make a notation of the reason when you're blocking a user. This would help to deal with issues if they come back to you and ask for their access again. If you deal with a lot of users it can be useful to remember why you blocked them.

Concrete questions / Next steps

@JobV this seems like a nice feature to have. What do you think?

/cc @DouweM