As an administrator, I can override max_page_size for pagination
In a REST call, users can specify how big the pages should be, up to `max_page_size`, which is currently hardcoded in pulpcore/app/pagination.py to 5000.
When this story is complete, a new optional setting should be created so admins can modify this amount. (Ideal maximum may be influenced by content types included for that installation.)
I suggest that this story be considered for pulpcore 3.1+