Ingest bower.io (Javascript package manager)

• !298 (closed), !299 (closed): Implement lister
• !299 (closed): Implement loader (Bower package loader is not needed as origins url are Git repositories)
• Lister run in docker
• Loader run in docker
• !298 (closed): Document lister
• !299 (closed): Document loader (Bower package loader is not needed as origins url are Git repositories)
• swh/infra/sysadm-environment#4555 (closed): Deploy on staging
• Call for public review
• Deploy on production

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Migrated from T4475 (view on Phabricator)