Bug 31306: Add search_ordered sub to order items with extra conditions

Bug 31306: Add search_ordered sub to order items with extra conditions

Commit message from JD:

On bug 27272 we are going to replace C4::Items::GetItemsInfo with Koha::Items
methods, but we need to keep the existing behaviour that is:

Order by publisheddate, enumchron for searisl, or by homebranch.branchname,
enumchron, LPAD( copynumber, 8, '0' ), desc dateaccessioned

Test plan:
Confirm that the code from the new method makes sense
Run t/db_dependent/Koha/Items.t

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>