New tag value for EXIF:Compression: JPEX XL

[johnrellis]

DNG 1.7 (June 2023) allows the use of JPEG XL compression:
https://helpx.adobe.com/camera-raw/digital-negative.html

and it defines the tag value 52546 for EXIF:Compression = JPEG XL. Exiftool does not know about that tag value:
https://exiftool.org/TagNames/EXIF.html#Compression

I don't know if any standards body has blessed 52546. I'm not about to pay $233 for the privilge of reading ISO/IEC 18181-1:2022 (JPEG XL image coding system: Part 1: Core coding system)

[Phil Harvey]

Thanks for pointing this out.  I'll update to the DNG 1.7 spec.

- Phil