feat(duckdb): set secrets via SecretsManager

[gforsyth]

Discussed in https://github.com/ibis-project/ibis/discussions/9633

^{Originally posted by andersbogsnes July 18, 2024} Now that DuckDB has implemented a proper credentials manager, is there some way of supporting that through Ibis natively?

https://duckdb.org/docs/configuration/secrets_manager

Today you'd either have to go via FSSpec which is going to be slower than native Duckdb, or make sure to run a .raw_sql('CREATE SECRET ...') beforehand.

Maybe some kind of set_credentials option for the backend?