XcmContext to buy_weight / refund_weight (#7563)

* added XcmContext to WeightTrader trait

* cargo fmt

* make xcm context optional

* make compile

* fix compile

* `XcmContext` to `buy_weight / refund_weight`

---------

Co-authored-by: Patricio Napoli <hi@patricionapoli.dev>
Co-authored-by: Giles Cope <gilescope@gmail.com>
Co-authored-by: parity-processbot <>

polkadot/runtime/test-runtime/src/xcm_config.rs

@@ -80,7 +80,12 @@ impl WeightTrader for DummyWeightTrader {
 		DummyWeightTrader
 	}
 
-	fn buy_weight(&mut self, _weight: Weight, _payment: Assets) -> Result<Assets, XcmError> {
+	fn buy_weight(
+		&mut self,
+		_weight: Weight,
+		_payment: Assets,
+		_context: &XcmContext,
+	) -> Result<Assets, XcmError> {
 		Ok(Assets::default())
 	}
 }