Ability to detect whether detect mimetype corresponds to the file extension

[C0rn3j]

As per https://github.com/ahupp/python-magic/issues/228#issuecomment-741967910, libmagic should be able to do this, but I do not see a way to get this library to give me the list of possible file extensions for a given file type.

Would be nice to have a verify_file_extension() function or something akin to it, but I can write that myself, it's just that I can't get the list at all.

mimetypes library does have a function for this.