New port: devel/p5-File-ShareDir-Tarball

If the shared files of a distribution are contained in a tarball (see
Dist::Zilla::Plugin::ShareDir::Tarball for why you would want to do that)
automatically extract the archive in a temporary directory and return the
path to that directory.

If called for a regular distribution without a bundle file
(shared-files.tar.gz), it'll return the original shared dir. In other words,
from the consumer point of view, it'll behave just like File::ShareDir.

WWW: https://metacpan.org/pod/File::ShareDir::Tarball

PR: 237109
Submitted by: Geoffroy Desvernay <dgeo@centrale-marseille.fr>
Reviewed by: tcberner (mentor)
Approved by: miwi (mentor)
Differential Revision: https://reviews.freebsd.org/D19858