Create module for perl_versions table

[preaction]

We need a DBIx::Class::Row class for the perl_versions table. This table tracks the Perl versions for various UI elements and could be made into an API later.

To build this module, we need to read the schema for the perl_versions table and convert it into the correct column definitions for DBIx::Class. See DBIx::Class::Manual::Example to get started with making DBIx::Class modules.

See cpan-testers/cpantesters-backend#7 for the backend process that will use this class.