Add DuckDBClient to recommended libraries

[mkfreeman]

Using DuckDB, users can create a database from .csv, .json, or .parquet files in a single line of code. Then, they can use familiar sql syntax (in a sql cell) to query their data.

This is an excellent entry point for data analysts unfamiliar with JavaScript, and has been repeatedly used by for demos and tutorials (see EDA workshop, PSI workshop).

This is especially important as it allows us to load data without introducing the construct of imports, which could feel overwhelming for new users.