[Fix] Weight calculations for Wild -> affects teleports (#1639)

* [Fix] Weight calculations for Wild -> affects teleports

* introduce a separate asset limit for teleports

* fix deposit

* reshuffle abstractions

* fix imports

* little refactoring

* Update parachains/common/src/xcm_config.rs

Co-authored-by: Squirrel <gilescope@gmail.com>

* add comments

Co-authored-by: Squirrel <gilescope@gmail.com>

parachains/common/src/xcm_config.rs

@@ -119,3 +119,17 @@ impl<Location: Get<MultiLocation>> FilterAssetLocation for ConcreteNativeAssetFr
 		matches!(asset.id, Concrete(ref id) if id == origin && origin == &Location::get())
 	}
 }
+
+/// A generic function to use for MultiAssetFilter implementations, currently used to differentiate
+/// between reserve operations and the rest of them.
+pub fn weigh_multi_assets_generic(
+	filter: &MultiAssetFilter,
+	weight: Weight,
+	max_assets: u32,
+) -> XCMWeight {
+	let multiplier = match filter {
+		MultiAssetFilter::Definite(assets) => assets.len() as u64,
+		MultiAssetFilter::Wild(_) => max_assets as u64,
+	};
+	weight.saturating_mul(multiplier).ref_time()
+}