Show coordinators who is coordinating working groups

[mhulet]

Is your feature request related to a problem? Please describe.
Local groups coordinators don't have a clear view of who is currently coordinating working groups and how many members are in each working group.

Describe the solution you'd like
We want a Dashboard view where we'll have a list of all working groups, members # and names/emails of WG coordinators that we can easily paste as recipients of a new email in Protonmail or any other email software.

Describe alternatives you've considered
We could at least set the working-group-coordinator tag for coordinators, so that we can filter the rebels list on this tag. And we could dig into our spreadsheet software to provide a kind of dashboard sheet.

Additional context
None.