[Tile-serving] [openstreetmap/osm2pgsql] Make clustering by geometry optional in flex output (#1504)

[Sarah Hoffmann]

We've discussed this some more and I don't think an automatic fallback is a good idea here. Imagine we allow clustering on arbitrary columns in the future. If a script has then a table that clusters on, say, housenumbers, an automatic fallback to 'auto' would be worse than not doing any clustering at all. So failing on an unknown clustering string sounds like the right thing to do. A script can always check for the osm2pgsql version and provide backwards compatibility but it should do so explicitly.

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