Add a duckdb export or convert base layer to duckdb

Duckdb has a lot of advantages over sqlite

• speed
• extended syntax
• built in support for arrays and other datatypes

In theory there is no particular reason for a duckdb export. You can just point duckdb at any of the semsql builds and it works. But there are some oddities that occur and it would be better to have a dedicated duckdb export

This could be a simple mirror of the sqlite. However, there is the opportunity to take advantage of increased expressivity. For example, we could have tables like

CREATE TABLE term_info (
   id VARCHAR,
   label VARCHAR,
   aliases VARCHAR[],
   ....
)

Inizia esaminando l’esportazione SQLite esistente e le build di semsql per comprendere lo schema attuale e le peculiarità descritte. Decidi se il lavoro debba fornire un’esportazione DuckDB dedicata o convertire il livello di base, quindi verifica che le tabelle risultanti supportino i tipi proposti orientati a DuckDB e rimangano utilizzabili da DuckDB.