`yardstick label explore ...` should provide way to focus on unlabeled matches

[willmurphyscode]

What would you like to be added:

When I run yardstick label explore <some-uuid> I should be able to quickly find any matches that are not labeled.

Why is this needed:

Otherwise, when labeling results for an image with a lot of matches, many of which are already labeled, searching for unlabeled matches involves a lot of additional scrolling.

Additional context: