Port GNU lister to the new Lister API

The GNU lister implementation must be ported to the new swh.lister.pattern.Lister API.

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Migrated from T2990 (view on Phabricator)

mentioned in merge request !202 (closed)

marked this issue as related to swh-scheduler#2442 (closed)

added Lister Origin-GNU priority:High labels

added priority:Normal label and removed priority:High label

assigned to @anlambert

mentioned in commit 4cf0c7f7

closed