Override javax.crypto.Cipher.toString()

 javax.crypto.Cipher.toString() currently doesn't print friendly information. Perhaps, it can be improved to include algorithm, mode and padding value data

> jshell> import javax.crypto.*;
>
> jshell> Cipher cipher = Cipher.getInstance("AES");
> cipher ==> javax.crypto.Cipher@5606c0b
>
> jshell> System.out.println(cipher);
> javax.crypto.Cipher@5606c0b