Is there a feature (planned?) to support querying the read journal by 
multiple tags. Typically projections in an event sourced application only 
update from a very small subset of the events. Say I have a UserProjection 
that creates/updates a UserReadModel from a UserRegistered event and all 
other User* events don't affect that read model. In this case it would be 
useful to have a queryByTags(Seq("UserRegistered"), ....) method on the 
read journal which would make (re)building that projection much more 
efficient.

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