[Tile-serving] [openstreetmap/osm2pgsql] Provide a stack trace on a lua error with flex backend (#1136)

[Paul Norman]

If you have an error in your lua script you get an error message like
```
Osm2pgsql failed due to ERROR: Failed to execute lua processing function: openstreetmap-carto.lua:533: Error in 'add_row': Trying to add relation to table 'planet_osm_line'
```

This doesn't provide as much information as a stack trace.

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