[C++] Deprecate Plasma C++

[asfimport]

Reporter: Antoine Pitrou / @pitrou
Assignee: Antoine Pitrou / @pitrou

Related issues:

• [C/GLib] Deprecate Plasma C/GLib bindings (is cloned by)

PRs and other links:

• GitHub Pull Request #14305
• Github PR

_{Note: This issue was originally created as ARROW-17861. Please see the migration documentation for further details.}

[asfimport]

Antoine Pitrou / @pitrou:
Handled by PR #14305

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 14305
#14305