create objects via cli

[unrival-protocol]

• create a cli tool that is linked to the command unrival
• create a command that creates an unrival object given a json file
• automatically hash (nested) file references in address, e.g.:
  target file.json
  [ { "interpretation": "/iterator", "address": "example.json" } ]
  will be converted to:
  [ { "interpretation": "/iterator", "address": "SOME_HASH" } ]
  and stored.