[Tile-serving] [openstreetmap/osm2pgsql] Define what "columns" should be in flex docs (#1134)

[Paul Norman]

The flex docs say `osm2pgsql.define_node_table(name, columns)` defines a node table, but give no information on the structure of the columns object.

As far as I can tell, columns must be a list of objects, each object defining a column. A single column is a lua table with the following possible keys and values
key | value
--|--
column | name of postgresql column
type | postgresql type for "normal" columns, or the geometry type for a geometry column
not_null | true if the column is a NOT NULL
create_only | true if the column is added to the create table command, but not filled when adding data

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