Query external JSON parameter schema received via AMQP before adding it to DB
We can provide parameter schemas of IC types as a link in the status update of an IC received via AMQP (relates to #66 (closed) and #67 (closed) ). Before the status update is stored in the DB, we should query the parameter schema provided via a link and store the JSON schema itself (not the link) to the DB. The API will then deliver always the completely resolved JSON schema, not the link.
Thereby, we would reduce the size of a status update (link versus entire schema) and could easily use external schemas.