[Tile-serving] [openstreetmap/osm2pgsql] Add ability to provide conninfo string (database URL) in -d field (#1242)

[FLacombe]

Dear maintainers,

Many softwares using libpq allow to provide a conninfo string with all required information in one single field instead of 3 different arguments.
https://www.postgresql.org/docs/11/libpq-connect.html#LIBPQ-CONNSTRING

For instance :

```sh
psql -d postgresql://mypgserver:5432/database
```

instead of 
```sh
psql -d database -h mypgserver -p 5432
```

It actually ease config writing and make scripts a little lighter
Would you accept to add this possibility to osm2pgsql -d argument please ?
```sh
osm2pgsql -d postgresql://mypgserver:5432/database
```

All the best

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https://github.com/openstreetmap/osm2pgsql/issues/1242
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