[Tile-serving] [openstreetmap/osm2pgsql] Add an option to prevent DROP CASCADE in -create mode (#763)

[Nikolai Lebedev]

Please add an option to prevent `DROP CASCADE` of imported tables before filling them up in `-create` mode. It can be false by default.
I have a lot of views depending on those tables, and they all get dropped when refilling osm data from scratch.
I know I can `TRUNCATE` manually and use an `-append` mode, but it's so much slower than `-create`.
I guess such an option shouldn't do no harm, but introduce some benefits instead.

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