[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add grouped-linemerge generalization (PR #2482)

[Sarah Hoffmann]

lonvia left a comment (osm2pgsql-dev/osm2pgsql#2482)

I did a quick test on the planet with a table of named highway using highway type, name and ref as grouping criterion. The source table has 114_456_912 rows. Computing the destination with grouping and line merge takes 9min30s and produces a table with 35_462_494 rows. Utterly feasible.

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