* allow draft/record owners to be set explicitly when creating/updating
  drafts/records
* if specified, the owners will override the "access.owned_by" section
  in the record's JSON
* the implementation assumes that the record's JSON structure follows
  invenio-rdm-records

* get the DraftMetadata class from the record service instead of
  directly importing it from invenio-rdm-records
* prevents issues with renaming of the metadata class, etc.

* apply Black formatting
* use plural for sub-commands, for consistency
* fix convert_to_recid() to always fetch the first PID of type 'recid'
* add command to reindex all (or some) records
* update method for instantiating RecordServices: allow the configuration
  of a factory function that creates a RecordService as desired
  (default: fetches services from current_rdm_records)

* add command for listing soft-deleted files
* add command for listing all files of a record

* previously, the 'any_user' need wasn't added to a known user's identity

* add further commands for managing drafts
* add command for listing users

* add commands for listing/adding/removing files from drafts
* add commands for listing/deleting drafts