[Tile-serving] [openstreetmap/osm2pgsql] Introduce separate COPY threads (#914)

[Paul Norman]

It's 30 minutes faster under this PR
```
Processing: Node(5043406k 4292.3k/s) Way(563353k 42.88k/s) Relation(6601450 1143.90/s)  parse time: 20083s
Node stats: total(5043406477), max(6285198313) in 1175s
Way stats: total(563353404), max(671171896) in 13137s
Relation stats: total(6602164), max(9334518) in 5771s
```

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