deposit of tarball/zip: return as main swh-id the directory id, add the synthetic revision id as ancillary information

To cover several use cases, the deposit of a tarball/zipfile must return as main swh-id the id of the root directory, and as ancillary information the id of the synthetic commit created at the moment of the deposit.

Migrated from T1152 (view on Phabricator)

Edited Jan 08, 2023 by Phabricator Migration user

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