O3-3002: Queue Module - REST endpoints can be accessed without authentication.

[IamMujuziMoses]

Issue I worked on

see https://issues.openmrs.org/browse/O3-3002

Checklist: I completed these to help reviewers :)

• Added Authorized annotations to the service classes: QueueService, QueueEntryService, QueueRoomService and RoomProviderMapService.
• Created PrivilegeConstants class to contain all privilege names and their descriptions.
• Added liquibase changesets that will do a default assignment of these privileges to roles.

[chibongho]

Thanks. This change looks reasonable. I'm not that familiar with permissions and liquibase, @dkayiwa @mseaton can you chime in here?

[mseaton]

This looks good to me, nice work @IamMujuziMoses