"Community Roles" dashboard view

[maneesha]

We have this dashboard view for badges where we see a list of each badge and how many people have that role.
There should be a similar page that lists each Community Role with the following columns:

• Role name (linking to summary - see below)
• Role assignees (linking to list of people who have ever had that role - see below)
• Current active count
• Total (all time) count - this should avoid duplicates if someone's role ended and re-started later

Role name page view columns:

• Role name
• Link to award? (Either "none" or Name and hyperlink to award)
• Auto-assigned?
• Link to membership?
• URL (if any; otherwise "none)
• Custom keys

Role assignees page view columns:

• Person
• Start Date
• End date (if any)
  This should also have filter by active/inactive

[maneesha]

@pbanaszkiewicz @elichad is there any other information needed to implement this feature?

[elichad]

We should consider who should have permission to access these views (as part of a wider discussion of whether 'read_only' users should be able to read everything or not)