builder pattern for MembershipFinder() and GroupFinder() should have filter for immediate/effective

Using the chained version of MembershipFinder, you can pass in subjects and or groups, but can't filter on immediate/effective memberships. You need to get all the results and then look at each membership. Similarly, chained GroupFinder().assignSubject(subject) can add a subject to find memberships for a subject, but there is no option to filter on immediate/effective