[C++] Add string starts-with/ends-with kernels

[asfimport]

Like Python str.startswith() and str.endswith()

Reporter: Ian Cook / @ianmcook
Assignee: David Li / @lidavidm

Related issues:

• [C++] String algorithm library for StringArray/BinaryArray (is a child of)
• [C++] Implement string/binary contains for exact matches (relates to)
• [C++] SQL-style glob string match kernel (relates to)
• [R] Bindings for stringr::str_starts, stringr::str_ends, base::startsWith and base::endsWith (is depended upon by)

PRs and other links:

• GitHub Pull Request #10448

_{Note: This issue was originally created as ARROW-12949. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
Issue resolved by pull request 10448
#10448