Add format property for Resource IIIF Manifest (#4596)
Add format property for Resource IIIF Manifest (#4596)

Co-authored-by: Chris Colvard <dc27902a6c7718c1c8ec06d9f113206a764a2f1f@gmail.com>

avalonmediasystem/avalon,avalonmediasystem/avalon,avalonmediasystem/avalon,avalonmediasystem/avalon