cli: add status command

Provides equivalent functionality to `yubico-piv-tool`

src/chuid.rs

@@ -32,7 +32,8 @@
 
 use crate::{error::Error, yubikey::YubiKey};
 use getrandom::getrandom;
-use std::fmt::{self, Debug};
+use std::fmt::{self, Debug, Display};
+use subtle_encoding::hex;
 
 /// CHUID size
 pub const CHUID_SIZE: usize = 59;
@@ -149,6 +150,16 @@ impl CHUID {
     }
 }
 
+impl Display for CHUID {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(
+            f,
+            "{}",
+            String::from_utf8(hex::encode(&self.0[..])).unwrap()
+        )
+    }
+}
+
 impl Debug for CHUID {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "CHUID({:?})", &self.0[..])