Add Definitions ability to GraphQL endpoints for Arranger

[rosibaj]

When using GraphQL, the descriptions fields is always empty. For Example, this is seen in the HCMI Arranger API endpoint:

• this field should be populated with the field/object definitions
• we need a way for the users to
• [ ] 1) import a file of definitions or
• [ ] 2) edit the definitions individually in the Arranger Admin UI
• [ ] 3) Have the definitions automatically populate in the GraphQL endpoint

-- note: KF needs this as well!