[Tile-serving] [openstreetmap/osm2pgsql] Retire multi output (#1062)

[Sarah Hoffmann]

I'd like to propose to deprecate and eventually remove the multi output.

The multi output was an interesting experiment but I don't think that it was ever really used in production by anybody. The only style I'm aware of is @pnorman experimental style. The code for the multi output is rather complicated and hard to maintain. There are also some performance issues we've never tackled. The new 'flex' output can do the same as the multi output but hopefully in a more flexible and performant way. 

For the moment, I'd just add a deprecation warning when the output is used. Once the 'flex' output is production-ready, we could add a Lua script that processes a multi output configuration and then remove the output completely.

If you are a user of the multi output, please comment here.

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