Polars support

[sk2]

Hi, I see many mentions of Pandas Dataframe integrations.
It would be nice to have a simple api for Polars dataframe integration (or a simple code example). Polars uses Arrow underneath so this should hopefully not be too hard.
DuckDB can read/write from Polars dataframes, which is nice for expressive sql, being able to do the same with Polars would be powerful.

Polars is a high performance upgrade on Pandas which is well suited to the performance in this project. Thanks!

[auxten]

Pandas 2.0 also uses Arrow as internal data format, we will support queries on memory Arrow format.