AVIF support

[reaseno]

There is AVIF support in image-rs, but to me, it seems it's not working.

[qarmin]

Is really avif supportet in image-rs? (decoding)
I see such errors when trying to open avif image

Cannot open image file "/home/rafal/Desktop/Untitled Folder/hato.profile0.8bpc.yuv420.no-cdef (copy).avif": The image format Avif is not supported
Cannot open image file "/home/rafal/Desktop/Untitled Folder/hato.profile0.8bpc.yuv420.no-cdef.avif": The image format Avif is not supported
Cannot open image file "/home/rafal/Desktop/Untitled Folder/sample (copy).avif": The image format Avif is not supported
Cannot open image file "/home/rafal/Desktop/Untitled Folder/sample.avif": The image format Avif is not supported
Cannot open image file "/home/rafal/Desktop/Untitled Folder/test_nclx (copy).avif": The image format Avif is not supported
Cannot open image file "/home/rafal/Desktop/Untitled Folder/test_nclx.avif": The image format Avif is not supported

[reaseno]

At least it says here:
https://github.com/image-rs/image

But yes, only 8bit :/
I don't like this library 😅

[qarmin]

I see also Requires the avif-native feature, uses the libdav1d C library. so it is unlikely that I add it by default(maybe I will add this as feature flag)