feat: UX: Support deferreds in addition to lambdas in Array.map, Array.filter

[NickCrews]

Is your feature request related to a problem?

these lambdas are often really simple, and it would be shorter and cleaner to use Deferreds

Describe the solution you'd like

gmails = emails.filter(_.contains("@gmail.com"))

What version of ibis are you running?

main

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

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[cpcloud]

Can you give this a try on the-epic-split? I believe we have addressed this there.

[cpcloud]

Oh, nevermind, this is slightly different than what I originally thought.

[kszucs]

I like this feature request. The implementation should be about checking for Deferred in ArrayValue.filter() method, and the input is indeed a deferred then wrap it with a function calling .resolve().

Implementation suggestion:

if isinstance(predicate, Deferred):
    body = predicate.resolve(parameter.to_expr())
else:
    body = predicate(parameter.to_expr())