Move grandpa crates to consensus folder (#13458)

* Move grandpa under consensus dir
* Rename grandpa folder
* Finish grandpa renaming
* Minor tweaks
* Cargo fmt
* Adjust path to chain spec

substrate/client/consensus/grandpa/rpc/src/notification.rs

@@ -0,0 +1,32 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+use parity_scale_codec::Encode;
+use sc_consensus_grandpa::GrandpaJustification;
+use serde::{Deserialize, Serialize};
+use sp_runtime::traits::Block as BlockT;
+
+/// An encoded justification proving that the given header has been finalized
+#[derive(Clone, Serialize, Deserialize)]
+pub struct JustificationNotification(sp_core::Bytes);
+
+impl<Block: BlockT> From<GrandpaJustification<Block>> for JustificationNotification {
+	fn from(notification: GrandpaJustification<Block>) -> Self {
+		JustificationNotification(notification.encode().into())
+	}
+}