[RPC API] data model w/ focus on read API’s: certs, objects

[lxfind]

• get object
• get certificate
• client service status/config

[arun-koshy]

pull/274 is updated with latest Rest Client code. Need to continue to improve this as Geniteam's feedback comes in. This is on the list of todos:

• Provide way to transfer publish module as bytes in json request - Ade
• Add rest client tests & documentation
• Add way to stop & start authorities reliably
• Ensure all error cases are handled
• Add 'NewAddress' endpoint
• Return output of move object as Json in call/transfer/publish endpoints.

[arun-koshy]

Initial Postman documentation can be found here: https://documenter.getpostman.com/view/19219089/UVeMGi23

Need to continue to update this and also properly add everyone to a Postman team workspace so they have access to the updated endpoints