Implement a Queue repository for the data access layer

[keithmanville]

Use the repository pattern to create a repository for the Queue Resource. This will be used to refactor parts of the queue service layer.

This is the first Resource repository that will set the patterns for future Resource repositories (Experiments, Plugins, etc.)

Definition of Done:

• The queue repository is implemented
• The queue service layer is refactored to make use of the queue repository
• All existing tests pass
• The feature is merged into dev