Add p5-DBIx-Handler 0.14

DBIx::Handler is fork-safe and easy transaction handling DBI handler.
It provides scope base transaction, fork safe dbh handling.

WWW: http://search.cpan.org/dist/DBIx-Handler/

• While I'm here:
  • Add LICENSE_FILE
  • Add p5-DBI to {BUILD|RUN}_DEPENDS
  • Move p5-Test-* to TEST_DEPENDS

PR: 214293
Submitted by: Sergei Vyshenski <svysh.fbsd@gmail.com>