[C++] Expand Python-UDF support to Arrow Substrait

[asfimport]

Currently, Python-UDFs are supported in Arrow at a low-level of abstraction. This issue is about expanding this support to Arrow Substrait, which is at a higher-level. This is intended for the Py/Arrow support of the use case in which a Substrait plan with Python UDFs is manually expressed using Ibis, automatically represented using Substrait, and automatically executed using Py/Arrow.

Reporter: Yaron Gvili / @rtpsw

PRs and other links:

• GitHub Pull Request #13500

_{Note: This issue was originally created as ARROW-16968. Please see the migration documentation for further details.}

[asfimport]

Apache Arrow JIRA Bot:
This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned per project policy. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

[github-actions]

This issue has been marked as stale because it has had no activity in the past 365 days. Please remove the stale label or comment below, or this issue will be closed in 14 days. If this improvement is still desired but has no current owner, please add the 'Status: needs champion' label.