Convert Public to CryptoTypePublicPair (#6014)

* Tabify code

* Implement CryptoTypePublicPair in app_crypto

* Cleanup redundancy

* Introduce to_public_crypto_pair to Public trait

* Implement method for test

substrate/primitives/application-crypto/src/lib.rs

@@ -262,6 +262,10 @@ macro_rules! app_crypto_public_common {
 
 		impl $crate::Public for Public {
 			fn from_slice(x: &[u8]) -> Self { Self(<$public>::from_slice(x)) }
+
+			fn to_public_crypto_pair(&self) -> $crate::CryptoTypePublicPair {
+				$crate::CryptoTypePublicPair($crypto_type, self.to_raw_vec())
+			}
 		}
 
 		impl $crate::AppPublic for Public {
@@ -298,6 +302,21 @@ macro_rules! app_crypto_public_common {
 				<$public as $crate::RuntimePublic>::to_raw_vec(&self.0)
 			}
 		}
+
+		impl From<Public> for $crate::CryptoTypePublicPair {
+			fn from(key: Public) -> Self {
+				(&key).into()
+			}
+		}
+
+		impl From<&Public> for $crate::CryptoTypePublicPair {
+			fn from(key: &Public) -> Self {
+				$crate::CryptoTypePublicPair(
+					$crypto_type,
+					$crate::Public::to_raw_vec(key),
+				)
+			}
+		}
 	}
 }