Data entity listing CLI tool

[magterskine]

There is a need to have tooling that can output what data is defined and available to a test.
Currently, to avoid duplication of already defined data, a test writer must manually check what data files have been committed.
It would be useful to run a command that would return a list of data entity names so I can quickly see if the data I need already exists.
Additionally, as the available data increases, it would be useful for this tool to discriminate on data type.
It is likely that this tooling would be a new RoboFile command.

Expected result

1. A new command is added to robo (robo data:list --type )
2. Type is optional (if not provided, default to all data types returned)
3. User can specify the data type defined in xml that they want to see
4. When ran, a list is returned to stdout
5. The list contains only the name of the entity
6. The list is sorted alphabetically
7. This command is documented

#distributed-CD

[tomreece]

Closing this due to inactivity and needing further internal grooming. @magterskine You can create a Jira ticket if you still feel this feature is necessary.