Emulate SQL's choose or (a very limited subset of) NumPy's choose.

Reporter: David Li / @lidavidm
Assignee: David Li / @lidavidm

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)
• [C++] An "if_else" kernel to combine two arrays based on a mask (is related to)
• [C++] Add a general "if, ifelse, ..., else" kernel ("CASE WHEN") (is related to)

PRs and other links:

• GitHub Pull Request #10642

_{Note: This issue was originally created as ARROW-13220. Please see the migration documentation for further details.}