duckdb import script

[adsharma]

Thank you for maintaining this database.

I created an import to duckdb script. Leaving it here just in case someone finds it useful.

The db is about 10% smaller:

 18M	world.db
 20M	world.sqlite3

Two notes:

• inserting created_at/updated_at into duckdb directly from sqlite errors out due to an issue I don't completely understand
• I rewired all the ids to a global_seq, like wikidata. This was necessary for my use case.