Get dispatch weight from the target chain (when DispatchFeePayment::AtTargetChain is used) (#1430)

* reintroduce From<SourceChain>InboundLaneApi

* impl From<Chain>InboundLaneApi for testnet runtimes

* use inboundlaneapi in relay

* remove unused OutboundXcmWeigher

* spelling

* added the only test to messages pallet

* fmt

bridges/bin/rialto-parachain/runtime/src/lib.rs

@@ -383,8 +383,6 @@ pub type Barrier = (
 	// ^^^ Parent & its unit plurality gets free execution
 );
 
-/// Outbound XCM weigher type.
-pub type OutboundXcmWeigher = FixedWeightBounds<UnitWeightCost, (), MaxInstructions>;
 /// XCM weigher type.
 pub type XcmWeigher = FixedWeightBounds<UnitWeightCost, Call, MaxInstructions>;
 
@@ -708,16 +706,26 @@ impl_runtime_apis! {
 			lane: bp_messages::LaneId,
 			begin: bp_messages::MessageNonce,
 			end: bp_messages::MessageNonce,
-		) -> Vec<bp_messages::MessageDetails<Balance>> {
+		) -> Vec<bp_messages::OutboundMessageDetails<Balance>> {
 			bridge_runtime_common::messages_api::outbound_message_details::<
 				Runtime,
 				WithMillauMessagesInstance,
-				WithMillauMessageBridge,
-				OutboundXcmWeigher,
 			>(lane, begin, end)
 		}
 	}
 
+	impl bp_millau::FromMillauInboundLaneApi<Block, bp_millau::Balance> for Runtime {
+		fn message_details(
+			lane: bp_messages::LaneId,
+			messages: Vec<(bp_messages::MessagePayload, bp_messages::OutboundMessageDetails<bp_millau::Balance>)>,
+		) -> Vec<bp_messages::InboundMessageDetails> {
+			bridge_runtime_common::messages_api::inbound_message_details::<
+				Runtime,
+				WithMillauMessagesInstance,
+			>(lane, messages)
+		}
+	}
+
 	#[cfg(feature = "runtime-benchmarks")]
 	impl frame_benchmarking::Benchmark<Block> for Runtime {
 		fn dispatch_benchmark(