Feature request: Add new command

[blackeangel]

Hi.
Can add support when using unsquashfs output to text files file_contexts.txt with contexts files and fs_config.txt with information like
path_to_file uid guid mode capabilities symlink

And add an assembly with the same files to squashfs.

For example, this will be useful for assembling this file system on Windows to save xattr of files.

Google already tried to do this, but gave up.
https://android.googlesource.com/platform/external/squashfs-tools/+/refs/heads/main/