BR-CNPJ extra data / how to include other UI's to a list?

See #488

There are several unofficial interfaces to the same list data that are provided in that PR. How can we include them in the record for people's benefit (see notes in PR about issues with official website)?

As these interfaces just republish list data from the BR-CNPJ publisher, we don't think these should be new lists of Secondary/Third/local status. https://org-idguide-handbook.readthedocs.io/en/latest/metadata/#list-type it should somehow all be in the same record with the same prefix.