[Backport from polkadot-sdk] Move chain definitions to separate folder (#2892)

* [Bridges] Move chain definitions to separate folder (#3822)

Related to
https://github.com/paritytech/parity-bridges-common/issues/2538

This PR doesn't contain any functional changes.

The PR moves specific bridged chain definitions from
`bridges/primitives` to `bridges/chains` folder in order to facilitate
the migration of the `parity-bridges-repo` into `polkadot-sdk` as
discussed in https://hackmd.io/LprWjZ0bQXKpFeveYHIRXw?view

Apart from this it also includes some cosmetic changes to some
`Cargo.toml` files as a result of running `diener workspacify`.

(cherry picked from commit 0711729d25)

* diener workspacify

bridges/chains/chain-kusama/Cargo.toml

@@ -0,0 +1,35 @@
+[package]
+name = "bp-kusama"
+description = "Primitives of Kusama runtime."
+version = "0.5.0"
+authors.workspace = true
+edition.workspace = true
+license = "GPL-3.0-or-later WITH Classpath-exception-2.0"
+
+[lints]
+workspace = true
+
+[dependencies]
+
+# Bridge Dependencies
+
+bp-header-chain = { path = "../../primitives/header-chain", default-features = false }
+bp-polkadot-core = { path = "../../primitives/polkadot-core", default-features = false }
+bp-runtime = { path = "../../primitives/runtime", default-features = false }
+
+# Substrate Based Dependencies
+
+frame-support = { git = "https://github.com/paritytech/polkadot-sdk", branch = "master", default-features = false }
+sp-api = { git = "https://github.com/paritytech/polkadot-sdk", branch = "master", default-features = false }
+sp-std = { git = "https://github.com/paritytech/polkadot-sdk", branch = "master", default-features = false }
+
+[features]
+default = ["std"]
+std = [
+	"bp-header-chain/std",
+	"bp-polkadot-core/std",
+	"bp-runtime/std",
+	"frame-support/std",
+	"sp-api/std",
+	"sp-std/std",
+]

bridges/chains/chain-kusama/src/lib.rs

@@ -0,0 +1,78 @@
+// Copyright (C) Parity Technologies (UK) Ltd.
+// This file is part of Parity Bridges Common.
+
+// Parity Bridges Common 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.
+
+// Parity Bridges Common 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 Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Primitives of the Kusama chain.
+
+#![warn(missing_docs)]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+pub use bp_polkadot_core::*;
+
+use bp_header_chain::ChainWithGrandpa;
+use bp_runtime::{decl_bridge_finality_runtime_apis, Chain, ChainId};
+use frame_support::weights::Weight;
+
+/// Kusama Chain
+pub struct Kusama;
+
+impl Chain for Kusama {
+	const ID: ChainId = *b"ksma";
+
+	type BlockNumber = BlockNumber;
+	type Hash = Hash;
+	type Hasher = Hasher;
+	type Header = Header;
+
+	type AccountId = AccountId;
+	type Balance = Balance;
+	type Nonce = Nonce;
+	type Signature = Signature;
+
+	fn max_extrinsic_size() -> u32 {
+		max_extrinsic_size()
+	}
+
+	fn max_extrinsic_weight() -> Weight {
+		max_extrinsic_weight()
+	}
+}
+
+impl ChainWithGrandpa for Kusama {
+	const WITH_CHAIN_GRANDPA_PALLET_NAME: &'static str = WITH_KUSAMA_GRANDPA_PALLET_NAME;
+	const MAX_AUTHORITIES_COUNT: u32 = MAX_AUTHORITIES_COUNT;
+	const REASONABLE_HEADERS_IN_JUSTIFICATON_ANCESTRY: u32 =
+		REASONABLE_HEADERS_IN_JUSTIFICATON_ANCESTRY;
+	const MAX_MANDATORY_HEADER_SIZE: u32 = MAX_MANDATORY_HEADER_SIZE;
+	const AVERAGE_HEADER_SIZE: u32 = AVERAGE_HEADER_SIZE;
+}
+
+// The SignedExtension used by Kusama.
+pub use bp_polkadot_core::CommonSignedExtension as SignedExtension;
+
+/// Name of the parachains pallet in the Kusama runtime.
+pub const PARAS_PALLET_NAME: &str = "Paras";
+
+/// Name of the With-Kusama GRANDPA pallet instance that is deployed at bridged chains.
+pub const WITH_KUSAMA_GRANDPA_PALLET_NAME: &str = "BridgeKusamaGrandpa";
+
+/// Maximal size of encoded `bp_parachains::ParaStoredHeaderData` structure among all Polkadot
+/// parachains.
+///
+/// It includes the block number and state root, so it shall be near 40 bytes, but let's have some
+/// reserve.
+pub const MAX_NESTED_PARACHAIN_HEAD_DATA_SIZE: u32 = 128;
+
+decl_bridge_finality_runtime_apis!(kusama, grandpa);