[Tile-serving] [openstreetmap/osm2pgsql] [Flex] Add callbacks to indicate start/end of stage processing (#1211)

[mmd]

Today, a Lua script has a global section, which gets executed right at the beginning, and a few callback functions for nodes, ways, and relations. However, there's no way for the script to figure out when the Flex backend enters or exits a given stage.

This could be useful to do some initialization steps upon entry of a stage, or trigger the creation of additional DB indexes when exiting stage 3.

As an alternative, providing a global "setup" and "teardown" function callback, similar to the way unit tests work, would be a good starting point.

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https://github.com/openstreetmap/osm2pgsql/issues/1211
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