Support for synchronize command with vaults in CLI

[stephen-deg]

I'm trying to use a vault on b2 to backup some files from my linux machine (using it as a NAS). Unfortunately it seems like synchronize isn't supported with vaults. I've got a hacky workaround via a network mount on my Windows PC and then using the Windows cyberduck client which does support synchronize and vaults. But it would be really great to be able to do this on the server instead of this solution. Maybe there's also a better solution from what I am doing for now?