New Schedules, Filter groups, Users, and Scheduling groups APIs

Added

• New Schedules API:
  • GET /v2/workforce-management/schedules/agents
• New Filter groups API:
  • GET /v2/workforce-management/filter-groups
• New Users API:
  • GET /v2/workforce-management/users
• New Scheduling groups API:
  • GET /v2/workforce-management/scheduling-groups