[Tile-serving] [openstreetmap/osm2pgsql] Rewrite tile expiry (management of expired tiles) (#709)

[SomeoneElseOSM]

Something that'd be really nice to have would be an osm2pgsql that didn't run out of memory with relatively high values of EXPIRY_MAXZOOM set in openstreetmap-tiles-update-expire script.  I particularly noticed this when using zoom levels > 20 but from looking at the expiry code (and then backing away very quickly) I suspect it could be made much more efficient at lower max zooms too.  See links from https://wiki.openstreetmap.org/wiki/User:SomeoneElse/mod_tile_28 for more info.

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