[Tile-serving] [openstreetmap/osm2pgsql] Add an sql wrapper around passed value in an add_row function (#1524)

[Nikolai Lebedev]

Last addition to a flex backend adds an sql_type, which is quite handy.
Another great feature could be addition of sql wrapper around passed column value in add_row function.
I guess all column values are being passed to a generated sql COPY command. 
This process is unreachable for lua script. Can it be exposed?
For example something like this

```lua
function osm2pgsql.process_node(object)
    tables.mytable:add_row({
        tags = 'jsonb_strip_nulls(' .. object.tags .. ')',
        geom = { create = "point" }
    })
end
```

Concatenation is used just to give an idea, real implementation could of course be cleaner.



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