Replace system config Index for Nonce (#14290)

* replace Index by Nonce

* replace Index by Nonce

* replace Index by Nonce

* replace Index by Nonce

* replace Index by Nonce

* wip

* remove index in lieu of nonce

* wip

* remove accountnonce in lieu of nonce

* add minor improvement

* rebase and merge conflicts

substrate/frame/system/src/extensions/check_nonce.rs

@@ -37,11 +37,11 @@ use sp_std::vec;
 /// some kind of priority upon validating transactions.
 #[derive(Encode, Decode, Clone, Eq, PartialEq, TypeInfo)]
 #[scale_info(skip_type_params(T))]
-pub struct CheckNonce<T: Config>(#[codec(compact)] pub T::Index);
+pub struct CheckNonce<T: Config>(#[codec(compact)] pub T::Nonce);
 
 impl<T: Config> CheckNonce<T> {
 	/// utility constructor. Used only in client/factory code.
-	pub fn from(nonce: T::Index) -> Self {
+	pub fn from(nonce: T::Nonce) -> Self {
 		Self(nonce)
 	}
 }
@@ -88,7 +88,7 @@ where
 			}
 			.into())
 		}
-		account.nonce += T::Index::one();
+		account.nonce += T::Nonce::one();
 		crate::Account::<T>::insert(who, account);
 		Ok(())
 	}