Allow for filtering on Users tab

As a Workspace Administrator, I'd like to be able to filter and sort the Users tab based on values in different columns — just like we can do it for modules.

The most important is to allow for filtering on 3 columns: Model Role, Workspace Administrator and Single Sign-on. This could really help with managing users access (assigning users with some roles the same selective access, checking if all users are SSO-enabled, updating all Workspace Admins' Selective Access/Role at once, hiding "No Access" users). The problem is that currently, the order of users on this view is determined by when they were added to the workspace, which means that people with similar roles are scattered across the (sometimes really long) list.