Pad/trim functions

[asfimport]

The Pad and Trimming functions

Reporter: Mike Seddon / @seddonm1
Assignee: Mike Seddon / @seddonm1

PRs and other links:

• GitHub Pull Request #9565

_{Note: This issue was originally created as ARROW-11655. Please see the migration documentation for further details.}

[asfimport]

Andrew Lamb / @alamb:
Issue resolved by pull request 9565
#9565