[Tile-serving] [osm2pgsql-dev/osm2pgsql] Point along line like the "centroid" of a linestring (Discussion #2469)

[Tobias]

Sometimes I simplify lines to just points (for minimal QA/debug info) or add points as well as the lines (for labels)

Right now I use the [`:centorid()`](https://osm2pgsql.org/doc/manual.html#geometry-objects-in-lua) for this.
However, when the lines are non-straight, those points don't end up on the line.

It would be nice if there where a pendant to `:centorid()` for lines or an along ([Turf](https://turfjs.org/docs/api/along)) helper to set it 50% of the way.

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