[Enh]: add support for Expr.list.eval

[tokoko]

We would like to learn about your use case. For example, if this feature is needed to adopt Narwhals in an open source project, could you please enter the link to it below?

Nothing specific at the moment. substrait will soon add support for lambda expressions and list/map transform functions and I want to be able to construct those with narwhals. I'm also thinking of a personal project with narwhals that will rely heavily on list transforms.

Please describe the purpose of the new feature or describe the problem to solve.

enable applying lambda expressions to list columns.

Suggest a solution if possible.

No response

If you have tried alternatives, please describe them below.

No response

Additional information that may help us understand your needs.

No response

[MarcoGorelli]

thanks for the request

for duck/polars this should be feasible, maybe ibis

definitely not fir pyarrow, nor for pandas and all its "speed up your pandas code by changing 1 line of code, so long as you're ok with unexpected crashes and incorrect results" piggy-backing copy-cats (but they don't work very well in general anyway)