improve usability of telnet Controller

[jeremyandrews]

Explore enhancing the telnet Controller with rustyline, maintaining a command history and allowing up-arrow to load the last command, etc.

[slashrsm]

It seems that rustyline currently assumes command line interface operates on standard input/outout. In order fo us to use it they would need to support arbitrary streams. I opened an issue to see if that would be an option.

kkawakam/rustyline#542

[slashrsm]

Also asked the same question in two other similar libraries (murarth/linefeed#73 and https://gitlab.redox-os.org/redox-os/liner/-/issues/14).