fix: Move functionaries to it's own app

[jaspnas]

Is your fix request related to a problem?

Consider creating a bug report. You can also describe why it should be a fix and not a bug.

Functionaries is currently part of members, I would like to limit the scope of members app to only be things containing personal data requiring extra care.

Describe the solution you'd like

A clear and concise description of what you want to happen.

Create it's own app for functionaries and move models and logic there, create URLs to redirect legacy links.

Additional context

Add any other context or screenshots about the feature request here.