With this, the deposit information needed for the deposit loader to build the
revision are sent in the "deposit" key. It contains the following keys:
- id: Deposit id
- collection: collection name
- client: client name
- author_date: creation date
- author: author
- committer_date: publisher date
- committer: publisher
This avoids:
- unnecessary redundancy. Metadata were set in multiple places even though identical.
- some information were no longer used (branch name, synthetic, revision type, etc...)