Relax Send/Sync/Clone requirements for Pair (#14647)

* Relax Send/Sync requirements for not instanced generic Pair

* Remove leftover

* Apply review suggestion

Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

* Further cleanup

* Trigger CI

---------

Co-authored-by: Sebastian Kunert <skunert49@gmail.com>

substrate/primitives/core/src/crypto.rs

@@ -486,7 +486,7 @@ pub trait ByteArray: AsRef<[u8]> + AsMut<[u8]> + for<'a> TryFrom<&'a [u8], Error
 }
 
 /// Trait suitable for typical cryptographic key public type.
-pub trait Public: ByteArray + Derive + CryptoType + PartialEq + Eq + Clone + Send + Sync {}
+pub trait Public: CryptoType + ByteArray + Derive + PartialEq + Eq + Clone + Send {}
 
 /// An opaque 32-byte cryptographic identifier.
 #[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Encode, Decode, MaxEncodedLen, TypeInfo)]
@@ -834,7 +834,7 @@ impl sp_std::str::FromStr for SecretUri {
 ///
 /// For now it just specifies how to create a key from a phrase and derivation path.
 #[cfg(feature = "full_crypto")]
-pub trait Pair: CryptoType + Sized + Clone + Send + Sync + 'static {
+pub trait Pair: CryptoType + Sized {
 	/// The type which is used to encode a public key.
 	type Public: Public + Hash;