Add sequence filtering expectations

[jackfirth]

For example, (expect-list-filter (list 2 4 6) even?) would find no faults in the list (2 4 6) or the list (1 2 3 4 5 6) and would add a context indicating that the filtering occurred. Needed by logging expectations to make it easy to assert that some log messages occurred above a certain log level while ignoring messages logged below that level.