Based on urbit-ob, supports only the @q
format.
Note that when encoding more than one byte, encode pads from the beginning to
an even number of bytes (as per the original implementation) and decode
ignores any dashes, tildes or spaces within the string.
urbit_q::encode(&[1]); // nec
let string = urbit_q::encode(&[1, 2, 3]); // doznec-binwes
urbit_q::decode(&string).unwrap(); // [0, 1, 2, 3]
urbit_q::decode("doz nec bin wes"); // Some([0, 1, 2, 3])
urbit_q::decode("do-z ne cb~inwes"); // Some([0, 1, 2, 3])
urbit_q::decode("nec-binwes"); // Some([1, 2, 3])
urbit_q::decode("hello world"); // None