Should work like stringr::str_pad(). Should call different of the kernels added in ARROW-12716 depending on the value of the side argument.

Reporter: Ian Cook / @ianmcook
Assignee: Nicola Crane / @thisisnic

Related issues:

• [C++] Left/right/center string padding kernels (depends upon)

PRs and other links:

• GitHub Pull Request #10638

_{Note: This issue was originally created as ARROW-13171. Please see the migration documentation for further details.}