Adding JPEG-XL Support

[ItsSharples]

From https://github.com/ImageMagick/jpeg-xl/blob/main/doc/format_overview.md

JPEG-XL Either starts with
0xFF0A for a Raw JPEG-XL Codestream
0x0000000C 4A584C20 0D0A870A for a ISOBMFF-based container

Checking the files at https://jpegxl.info/art/2021-04_jon.html, I can confirm that 0xFF0A is used for Raw Codestreams

[NebularNerd]

I've added a PR to handle these, one small quirk/annoyance is that the raw FF0A header is tiny (I know they want to keep file size down), however, this will lead to confidence issues against .qrp files if the next byte in a raw stream is 00

puremagic/puremagic/magic_data.json

Line 1208 in 5cdc4a0

["ff0a00", 0, ".qrp", "", "QuickReport Report"],

[cdgriffith]

Thank you for the info @ItsSharples and PR for it @NebularNerd! Added in https://github.com/cdgriffith/puremagic/releases/tag/1.21

Unfortunately low confidence is just a fact of life with files like this.