Bug 17755: Introduce Koha::Patron::Attribute::Type(s)

Bug 17755: Introduce Koha::Patron::Attribute::Type(s)

This patch introduces the Koha::Object-based classes for handling
patron attribute types.

It also adds branch limitation handling to the
Koha::Patron::Attribute::Type class.

It is built on top of the new Koha::Object::Library::Limit class
that extends Koha::Object so it handles library limits.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>