Returns a list of metadata authorities that provided metadata on
the given target.
They can then be used to get the raw `extrinsic metadata <https://docs.softwareheritage.org/devel/glossary.html#term-extrinsic-metadata>`__ collected on
that object from each of the authorities.
:param string target: The core SWHID of the object whose metadata-providing
authorities should be returned
{common_headers}
:>jsonarr string type: Type of authority (deposit_client, forge, registry)
:>jsonarr string url: Unique IRI identifying the authority
:>jsonarr object metadata_list_url: URL to get the list of metadata objects