app_queue: Added reason pause of member

In app_queue added value Paused Reason on QueueMemberStatus when a member
on queue is paused and the reason was set.

ASTERISK-25480 #close
Reporte by: Rodrigo Ramírez Norambuena

Change-Id: Ia5db503482f50764c15e2020196c785f59d4a68e