feat: make n arg optional for Value.topk()

[NickCrews]

Is your feature request related to a problem?

I want to see the most common values in a column. Currently, I am using https://github.com/NickCrews/ibis-widget to get scrolling and pagination, the best experience I have found so far is I do table.col.topk(100000000).widget(), and then I can scroll/paginate to only go down as far as I want. Note that I just chose an arbitrary large N so that I'm not getting limited. It would be cleaner and less typing if I could just do table.col.topk().widget(), in which case there would be no limit() clause tacked on at the end.

Not a huge need, my workaround is totally easy.

What is the motivation behind your request?

No response

Describe the solution you'd like

def topk(k: int | None = None, by=None, *, name=None)

What version of ibis are you running?

main

What backend(s) are you using, if any?

No response

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