Add metadata extraction support for non supported Exiv2 files.

A new ImageMagick wrapper using internally IM::identify C++ API will list all
ImageMagick properties and host all information to a dedicated Xmp.IMProperties XMP namespace.

Screenshot with FITS astro-photo images taken from NASA/CHANDRA radio-telescope: https://imgur.com/QRHsGOE

CCBUGS: 435231
CCBUGS: 393408
BUGS: 417431
FIXED-IN: 4.3.0