This task depends on successful completion of T231598 and T231600

Acceptance Criteria:

• Define route History count routes
  • /page/{title}/history/counts/editors
• Request:
  • Must support HTTP GET only
  • Request body must be empty
• Response
  • Response must return JSON
  • Response JSON must have structures:

{
    "editors": 24
}

• editors: total number of unique editors