Fix EXIF metadata extraction from documents and support other media type

[sijandh35]

Overview

GeoNode has a feature to extract EXIF data
from documents, specifically for JPG/JPEG files
(

geonode/geonode/documents/exif/utils.py

Line 74 in 7a6c46e

if ext[1:] in {"jpg", "jpeg"}:

).

It is good to verify the functionality and fix it (since apparently it doesn't work well; e.g., the doc_file no longer in Document attribute
and location extraction need to be checked and fixed), and to extend it to other media type (e.g., PNG).