Implement a new EntityType dataclass that encapsulates constants associated with Dioptra Resources.

The implementation may look something like this.

@dataclass
class EntityType:
    name: str
    key: str
    id: int

QUEUE_TYPE = EntityType("Queue", "queue", 1)
EXPERIMENT_TYPE = EntityType("Experiment", "experiment", 2)
PLUGIN_FILE_TYPE = EntityType("Plug-in File", "plugin_file", 3)

Definition of done

• identify all constants that need to be defined for each resource
• Implement the dataclass and instantiate instances of the new dataclass for each Dioptra resource
• Remove and duplicative constants and replace with references to new dataclass
• All existing tests pass
• The feature is merged into dev