Send feature outputs to DuckDB file (instead of SQLite)

[d33bs]

We could use DuckDB to help increase performance and data type reliability within the project. While SQLite is useful in this regard it likely won't be as performant and has unstrict data typing which could lead to inference problems downstream. For example: Parquet data types map more directly to DuckDB than they do to SQLite types.

Brought up in conversation with @MikeLippincott