[phashDuplicateTagger] Normalize tags on duplicate scene processing

[SmutsigGulag]

Often there's more tags/info on a lower quality scene. This aims to normalize the tags between duplicate scenes, avoiding data loss.

[stg-annon]

this would be more of a merging task to be done when deleting an unwanted file/scene, for example if this plugin was run with PhashDistance.LOW many scenes that may not in fact be duplicates would have their tags merged, at the very least it should be an option for those want want to perform this task

The plugin was designed in a way to try and leave the scenes untouched of the cleanup task was run which would not be the case if the tags of of scenes are merged together

[scruffynerf]

I like the idea of this, but it needs more work. Maybe as part of the revamp of for v24, we can work this idea?