"_provenance" attribute should be a JSON Object with additional metadata (dates, comment, etc...)

[redmitry]

Currently, each object has technical timestamps like _created, _updated, _deleted that are to be moved to the compound _provenance. object with "orcid" property of the action performer. example;

"_provenance": {
    "orcid": "0000-0000....",
    "created": "2018-04-05T00:00:00Z",
    "updated": "2018-05-05T00:00:00Z",
    "deleted": "2019-05-05T00:00:00Z",
}

Accordingly, "_created", "_updated" and "_deleted" should be removed from the root.

[jmfernandez]

Fixed