[Tile-serving] [openstreetmap/osm2pgsql] Create primary keys (#1216)

[Jochen Topf]

This is pretty easy to achieve using the new flex backend. You can define your own table columns there: 

```
...
{ column = 'id', type = 'serial', create_only = true },
...
```

The type `serial` is simply the postgresql type which creates an autoincrement int column, the `create_only` flag tells osm2pgsql to not try to put any data in there. Then, after the first import, call `CREATE UNIQUE INDEX` to build yourself an index.

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