Add support for HEIC images for training via libheif library

[lanxinger]

Still images at high quality take up a lot of space.

The High Efficiency Image File Format (HEIF) solves that by using better compression resulting in lower file sizes at the same quality level Wikipedia: High_Efficiency_Image_File_Format when compared to similar image compression format Comparison

Describe the solution you'd like I propose a support of HEIF files (HEIC,AVIF) via libheif. It is already being used in a lot of open source projects like GIMP, ImageMagick or OpenImageIO