ingest hackage.haskell.org, the Haskell package repository

This one is a follow up of #1002

• swh/devel/swh-lister!300 (closed), Implement lister
• swh/devel/swh-loader-core!313 (closed), Implement loader
• Lister run in docker
• Loader run in docker
• swh/devel/swh-lister!300 (closed), Document lister
• swh/devel/swh-loader-core!313 (closed), Document loader
• Deploy on staging
• Call for public review
• Deploy on production

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Migrated from T4494 (view on Phabricator)