feat: support kwargs for field functions

[ritchie46]

closes #58

We cannot introspect the passed function so we must give it a new name. You must pass:

#[polars_expr(output_type_func_with_kwargs=<function_name>)]

Upstream changes; https://github.com/pola-rs/polars/pull/13944

[ion-elgreco]

@ritchie46 👀ooh nice