Add distinct_on to dataframe api #11011
Description
Is your feature request related to a problem or challenge?
The dataframe api has a distinct(self) function however it's missing a distinct_on equivalent that is available in the logical plan. DISTINCT ON is available for use via sql and this issue is to add the equivalent to the dataframe api.
Describe the solution you'd like
A new function distinct_on( self, on_expr: Vec<Expr>, select_expr: Vec<Expr>, sort_expr: Option<Vec<Expr>>, ) -> Result<DataFrame>
added to the dataframe api.
Describe alternatives you've considered
No response
Additional context
No response