[Merged by Bors] - feat(data/set/basic): add set.subset_range_iff_exists_image_eq
and set.range_image
#14203
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set.subset_range_iff_exists_image_eq
andset.range_image
;set.can_lift
(name fixed fromset.set.can_lift
);set.exists_eq_singleton_iff_nonempty_subsingleton
.