[feature request] Display QR code for slatepack address

[cliik]

As a user: I would like to scan a QR code to get the slatepack address
I often find myself needing to send grin to CLI wallets (e.g. on a remote server I am SSH'ing to). The most natural solution is to use TOR slatepack addresses, but the process to share the address is difficult.

It would be much easier if the CLI wallet could show a QR code that I can scan with my mobile wallet.
https://crates.io/crates/qr_code

My current approach
Currently, this involves me copy/pasting the slatepack address from CLI and messaging it to my phone somehow, to copy/paste into my mobile wallet. It is cumbersome and time consuming.

Additional context
I don't think this would be too difficult, and I will even volunteer myself to do the implementation, if others think this would be a good addition to the wallet.

See this Rust crate for an example with ascii rendered QR codes:
https://crates.io/crates/qr_code