interface: Add get_listers method

Add new method to scheduler interface returning the full list of listers registered in the database.

Related to swh-web#3127 (closed)

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Migrated from D5907 (view on Phabricator)

Some references in the commit message have been migrated:

• T3127 is now swh-web#3127 (closed)

Build is green

Patch application report for D5907 (id=21200)

Rebasing onto 9e1b4145...

Current branch diff-target is up to date.

Changes applied before test

commit 7f51f274ed4c0fbf2e38b511125aae16884fa975
Author: Antoine Lambert <anlambert@softwareheritage.org>
Date:   Tue Jun 22 14:35:50 2021 +0200

    interface: Add get_listers method
    
    Add new method to scheduler interface returning the full list of
    listers registered in the database.
    
    Related to swh/devel/swh-web#3127

See https://jenkins.softwareheritage.org/job/DSCH/job/tests-on-diff/374/ for more details.

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