[Tagging] [RFC] Feature Proposal - Replace `*:signed` suffix key with `signed:*` prefix key

[Matija Nalis]

Cross-posting from the forum:
https://community.openstreetmap.org/t/rfc-feature-proposal-replace-signed-suffix-key-with-is-signed-prefix-key/8459/45

Voting on https://wiki.openstreetmap.org/wiki/Proposed_features/Replace_*:signed_with_is_signed:* 
has now started.


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