Exif metadata read/write support

[Shnatsel]

Exif metadata can contain information about the orientation in which a photo was taken, which is crucial to be able to display images correctly. Being able to write Exif metadata is important to keep the metadata after processing an image.

Among other things, this is needed by wondermagick.

Read support

• [x] JPEG
• [x] PNG - #2566 but pending an upgrade to png v0.18
• [x] WebP
• [ ] TIFF
• [ ] AVIF - is Exif common in AVIF?

Write support

• [x] JPEG #2537
• [x] PNG #2539
• [x] lossless WebP #2539
• [ ] TIFF
• [ ] AVIF blocked on https://github.com/kornelski/cavif-rs/issues/76

Third-party read support

• [x] JPEG XL via jxl-oxide