Allow loading large images in Arender

Steps to reproduce:

• Upload a large image file (in this case, a 1.8 GB TIFF image) to a folder in Nuxeo.
• Click on the Annotations pill.
  => After a few seconds, a warning appears (see screenshot)
• Click close on the warning box to ignore the warning and continue loading the image.
  => After 5 minutes, image is still loading.
  => After 10 minutes, image has failed to load. (see screenshot)