Create a user_payment_detail method in OpenILS::Application::Actor

Create a user_payment_detail method in OpenILS::Application::Actor

In relation to LP#812382, I've created a new API, open-ils.actor.user.payments.detailed, which allows you to pull in information
regarding the location (workstation name) and accepting user (username) for a particular user's payment history.
This is the beginnings of a customization which allows for additional detail when attempting to audit payment histories via the staff client.

Additional work is still needed to "link up" this API in the staff client, however, this takes care of the backend Perl.

Signed-off-by: Michael Peters <mrpeters@library.in.gov>