[bug#49451] Adding package aparte (rust XMPP TUI client)

[southerntofu]

Hello,

In this threads I will submit patches to include package aparte, from 0.2.0 
release on Github. There's a few missing crates that will be added to 
gnu/packages/crates-io.scm, and the aparte package is added to 
gnu/packages/messaging.scm as suggested in the #guix IRC channel.

This is my first package for guix so don't hesitate to tell me if i'm doing 
something wrong. Also, i noticed some packages in crates-io.scm are not ordered 
alphabetically. I tried not to mess the order even more but did not reorder 
packages which were already misordered.

southerntofu