Introduce a new `swh loader-metadata` subcommand and properly test it

Use the proper entry point to register it in swh.core, and use the root swh cli group in tests to make sure it's properly hooked up.

approved this merge request

bikeshed: swh metadata-loader is probably more appropriate

sounds fine to me

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added 1 commit

• faa14e9c - Introduce a new `swh metadata-loader` subcommand and properly test it

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here, have one more coat of paint ;-)

enabled an automatic merge when the pipeline for faa14e9c succeeds

Jenkins job DLDMD/gitlab-builds #26 succeeded .
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merged

mentioned in issue swh/infra/sysadm-environment#4794 (closed)