[Rust][DataFusion] Move `expressions` and `inputs` into LogicalPlan rather than helpers in util

[asfimport]

move expressions and inputs into LogicalPlan rather than helpers in util, and use Visitor rather than hard coded list

Goal is to consolidate the expression walking in one place

Reporter: Andrew Lamb / @alamb
Assignee: Andrew Lamb / @alamb

PRs and other links:

• GitHub Pull Request #9568

_{Note: This issue was originally created as ARROW-11709. Please see the migration documentation for further details.}

[asfimport]

Andrew Lamb / @alamb:
Issue resolved by pull request 9568
#9568