Use swh.model.model helpers to compute object identifiers
This will allow us to change the signature of the swh.model.identifiers
functions to use model objects directly instead of dicts.
Test Plan
tox
Migrated from D4266 (view on Phabricator)
This will allow us to change the signature of the swh.model.identifiers
functions to use model objects directly instead of dicts.
tox
Migrated from D4266 (view on Phabricator)