[USER MODERATION] - 3rd deliverable - sort records by 'verified'

[alejandromumo]

verified information should be added to the record so we can filter or sort records during search based on the verified property.

In this issue, we should:

• Add verified property to a record
• Add filtering / sorting to record's search (e.g. similar to what is done on Zenodo)
• Tests

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REQUIRES 2ND DELIVERABLE:

• [USER MODERATION] - 2nd deliverable - user after actions invenio-users-resources#95