[Tile-serving] [openstreetmap/osm2pgsql] Add lua hooks for processing diff files (#1526)

[doskabouter]

Would it be possible/doable to add some hooks so I can at least observe modifications on openstreetmap objects when processing diff files?
As I read it, modifications are done by a delete and an insert so I can't use triggers in the database to see what exactly changed. Ideally I would also have access to some persistent storage (be it local files or database) where I can put the results of the modification analysis in (mainly for invalidating tiles only when "relevant" changes happen)

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