[Tagging] Network-tag needs extension

[Lisbeth Salander]

A similar problem was fixed for brands by adding the key brand:wikidata
<https://wiki.openstreetmap.org/wiki/Key:brand:wikidata>. Maybe a key
like network:wikidata could be introduced.

Or, if the network has no wikidata, just use operator and operator:wikidata.

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