fixup! feat!: add KeyRing + related types + fns

Author: 110CodingP

src/keyring/error.rs

@@ -35,15 +35,6 @@ pub enum KeyRingError<K> {
         /// The expected descriptor
         expected: Box<ExtendedDescriptor>,
     },
-    /// The default keychain is missing.
-    MissingDefaultKeychain,
-    /// The default keychain is not as expected
-    DefaultKeychainMismatch {
-        /// The loaded default keychain
-        loaded: K,
-        /// The expected default keychain
-        expected: K,
-    },
 }
 
 impl<K> fmt::Display for KeyRingError<K>
@@ -78,14 +69,6 @@ where
                     keychain, loaded, expected,
                 )
             }
-            Self::MissingDefaultKeychain => {
-                write!(f, "loaded data is missing the default keychain")
-            }
-            Self::DefaultKeychainMismatch { loaded, expected } => write!(
-                f,
-                "Default keychain mismatch: loaded {}, expected {}",
-                expected, loaded
-            ),
         }
     }
 }