[Tile-serving] [openstreetmap/osm2pgsql] [Flex] Provide conninfo to Lua script (#1212)

[mmd]

I added a number of use cases to https://github.com/openstreetmap/osm2pgsql/issues/1211#issuecomment-645287526, which all depend on database access, and are equally relevant to this issue.

My assumption is that osm2pgsql will not provide a generic interface to execute database queries (both SELECTs, UPDATES, INSERT, etc.), hence the need for an external Lua library to access the database.

To avoid hard-coding database names, or doing any strange tricks to extracts the relevant parameters from the osm2pgsql command line, having the connection parameters readily available in Lua seemed like the least intrusive option.

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