"Origin" request are disco requests to know if a message sender is a bot or coming from a
gateway. It was sending request on every message, including pubsub/PEP events, resulting
in requests done to many entities, including ones not cacheables (bare entities or third
party servers, without caps mechanisms).
To avoid that, the requests is now done only for printable messages. To use
`client.is_message_printable` correctly, origin check has be moved to the end, after
`message_parse` trigger, so attachments are added to data.
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