Image inference

[chocolatkey]

Closes #176

• Includes the streaming working of Implement remote streaming of publications #211 (no changes, no need to re-review)
• Add a helper to transform fetchers and resources into interfaces compatible with Go's fs.FS and fs.File
• Add support for hash property in links, with a list of recognized algorithms and utility functions
• Add --inspect-images and --hash flags to rwp manifest utility to enable inference of additional image metadata

[chocolatkey]

@mickael-menu regarding the dependency issue, as per the meeting I'm going to deal with this after the merge, as the perceptual hashing package (which is not maintained) itself depends on that image resizing dependency. Furthermore, we may want to move the image inspection code out of the go-toolkit into the readium-cli

[mickael-menu]

Thank you for making the changes