xcm: Change TypeInfo::path to not include staging (#1948)

The `xcm` crate was renamed to `staging-xcm` to be able to publish it to
crates.io as someone as squatted `xcm`. The problem with this rename is
that the `TypeInfo` includes the crate name which ultimately lands in
the metadata. The metadata is consumed by downstream users like
`polkadot-js` or people building on top of `polkadot-js`. These people
are using the entire `path` to find the type in the type registry. Thus,
their code would break as the type path would now be [`staging_xcm`,
`VersionedXcm`] instead of [`xcm`, `VersionedXcm`]. This pull request
fixes this by renaming the path segment `staging_xcm` to `xcm`.

This requires: https://github.com/paritytech/scale-info/pull/197

---------

Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com>

polkadot/xcm/src/lib.rs

@@ -89,6 +89,7 @@ macro_rules! versioned_type {
 		)]
 		#[codec(encode_bound())]
 		#[codec(decode_bound())]
+		#[scale_info(replace_segment("staging_xcm", "xcm"))]
 		$(#[$attr])*
 		pub enum $n {
 			$(#[$index3])*
@@ -150,6 +151,7 @@ macro_rules! versioned_type {
 		)]
 		#[codec(encode_bound())]
 		#[codec(decode_bound())]
+		#[scale_info(replace_segment("staging_xcm", "xcm"))]
 		$(#[$attr])*
 		pub enum $n {
 			$(#[$index2])*
@@ -310,6 +312,7 @@ versioned_type! {
 #[codec(encode_bound())]
 #[codec(decode_bound())]
 #[scale_info(bounds(), skip_type_params(RuntimeCall))]
+#[scale_info(replace_segment("staging_xcm", "xcm"))]
 pub enum VersionedXcm<RuntimeCall> {
 	#[codec(index = 2)]
 	V2(v2::Xcm<RuntimeCall>),