fn decode_tg_socks_proxy(_context: &Context, qr: &str) -> Result<Qr>
scheme: https://t.me/socks?server=foo&port=123 or https://t.me/socks?server=1.2.3.4&port=123
https://t.me/socks?server=foo&port=123
https://t.me/socks?server=1.2.3.4&port=123