Add .rows function to DataFrame

[jarredparrett]

Wondering if there is any consideration for adding a .rows function to the org.polars.scala.polars.api.DataFrame implementation.

https://pola-rs.github.io/polars/py-polars/html/reference/dataframe/api/polars.DataFrame.rows.html

[chitralverma]

let me check this out

[jarredparrett]

Started taking a look at it, and the underlying function is row_tuples.

Happy to raise a PR to implement it.

[chitralverma]

@jarredparrett my bad for the late response, please raise a PR for this if its not too much. thanks a lot