Feature Request: Ticket metric reporting

[wrongecho]

On the back of #225 - "Add more to reporting (Average Response and Resolution Time, Service Requests, Ticket satisfaction)"

• [x] Ticket counts (e.g. X tickets opened this month)
• [ ] Average response time (need to determine if a "response" is a ticket being assigned or replied to)
• [X] Average resolution time
• [ ] Ticket satisfaction stats
  • We already have the ticket satisfaction smiley/sad faces - with notifications issued if a sad face is selected. Possibly we should limit the ability to give feedback to ~30 days after the ticket is closed?
• [ ] Ticket counts by priority and category

[wrongecho]

Halfway there