[Tile-serving] [openstreetmap/osm2pgsql] Add some Lua helper functions with docs, and tests for them (#1084)

[Jochen Topf]

@pnorman Yes, @mmd-osm is right. The idea here is the `create` function gets the data in a format that's easy for the user to write and converts it into something that is as fast as possible to execute for millions of objects.

For instance in the case of the "clean" function, it allows you to set up equality and prefix matches using the intuitive "foo" and "foo*" syntax, but we don't want to check for the `*` every time etc. So the create function sets up two different data structures for the different types of matches.

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