[OGR provider] querySubLayerList(): use GDAL 3.6.0 OGR_L_GetGeometryTypes() #50491
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Use OGR_L_GetGeometryTypes() to get the actual geometry types of a layer.
Cf OSGeo/gdal#6491
With it, loading a 1.6 GB GeoPackage of 1.3 million polygon features (with a generic unknown geometry type) goes down from ~ 8 seconds (debug QGIS build + release GDAL build) to 650 ms.