Support transfer command

[chipsenkbeil]

A friendly wrapper of reading and writing a file, where we specify a remote and local just like with scp.

distant transfer path/to/local example.com:path/to/remote
distant transfer example.com:path/to/remote path/to/local

[sureyeaah]

@chipsenkbeil Can you assign this to me

[chipsenkbeil]

@sureyeaah use distant client transfer instead of distant transfer to keep consistent with other client operations.

[chipsenkbeil]

@sureyeaah how is progress with this issue? Anything I can help answer to get you started?

[chipsenkbeil]

@sureyeaah checking in again to see if you need help getting started. If I don't hear from you, then I'll be moving this issue back to the backlog at the end of the week! 😄

[chipsenkbeil]

Unassigning and moving back to backlog for now.

[chipsenkbeil]

Now that we've refactored the CLI a bit, we can have a top-level distant copy command since the remote filesystem-specific commands are underneath distant fs.