Define separate signed extension for BHR/BHW (#1776)

- Make signed extensions for indirect runtimes more extensible
- Define separate signed extension for BHR/BHW

bridges/relays/client-bridge-hub-rococo/src/lib.rs

@@ -16,6 +16,7 @@
 
 //! Types used to connect to the BridgeHub-Rococo-Substrate parachain.
 
+use bp_bridge_hub_wococo::PolkadotSignedExtension;
 use bp_messages::MessageNonce;
 use codec::Encode;
 use relay_substrate_client::{
@@ -65,7 +66,7 @@ impl ChainWithTransactions for BridgeHubRococo {
 	) -> Result<Self::SignedTransaction, SubstrateError> {
 		let raw_payload = SignedPayload::new(
 			unsigned.call,
-			bp_bridge_hub_rococo::SignedExtensions::new(
+			bp_bridge_hub_rococo::BridgeSignedExtension::from_params(
 				param.spec_version,
 				param.transaction_version,
 				unsigned.era,

bridges/relays/client-bridge-hub-rococo/src/runtime_wrapper.rs

@@ -21,14 +21,14 @@
 use codec::{Decode, Encode};
 use scale_info::TypeInfo;
 
+use bp_bridge_hub_rococo::BridgeSignedExtension;
 pub use bp_header_chain::BridgeGrandpaCallOf;
 pub use bp_parachains::BridgeParachainCall;
 pub use bridge_runtime_common::messages::BridgeMessagesCallOf;
 pub use relay_substrate_client::calls::SystemCall;
 
-// TODO:check-parameter - check SignedExtension
 /// Unchecked BridgeHubRococo extrinsic.
-pub type UncheckedExtrinsic = bp_bridge_hub_rococo::UncheckedExtrinsic<Call>;
+pub type UncheckedExtrinsic = bp_bridge_hub_rococo::UncheckedExtrinsic<Call, BridgeSignedExtension>;
 
 // The indirect pallet call used to sync `Wococo` GRANDPA finality to `BHRococo`.
 pub type BridgeWococoGrandpaCall = BridgeGrandpaCallOf<bp_wococo::Wococo>;