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

[leijurv]

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

Sorry the CI did not pass, I swear it should this time. I fixed some small mistakes and performance issues. I was inserting and committing in a loop (bad). Replaced that with `COPY FROM`. I removed a pointless `order by`. I fixed out of date comments. lonvia [said](https://github.com/osm2pgsql-dev/osm2pgsql/pull/2482#discussion_r3364833768) `we are going to need lots and lots of tests for the update case` so I made the fuzzer more thorough.

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