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/v3/junction.rs

@@ -49,6 +49,7 @@ use serde::{Deserialize, Serialize};
 	Serialize,
 	Deserialize,
 )]
+#[scale_info(replace_segment("staging_xcm", "xcm"))]
 pub enum NetworkId {
 	/// Network specified by the first 32 bytes of its genesis block.
 	ByGenesis([u8; 32]),
@@ -116,6 +117,7 @@ impl TryFrom<OldNetworkId> for NetworkId {
 	Serialize,
 	Deserialize,
 )]
+#[scale_info(replace_segment("staging_xcm", "xcm"))]
 pub enum BodyId {
 	/// The only body in its context.
 	Unit,
@@ -186,6 +188,7 @@ impl TryFrom<OldBodyId> for BodyId {
 	Serialize,
 	Deserialize,
 )]
+#[scale_info(replace_segment("staging_xcm", "xcm"))]
 pub enum BodyPart {
 	/// The body's declaration, under whatever means it decides.
 	Voice,
@@ -261,6 +264,7 @@ impl TryFrom<OldBodyPart> for BodyPart {
 	Serialize,
 	Deserialize,
 )]
+#[scale_info(replace_segment("staging_xcm", "xcm"))]
 pub enum Junction {
 	/// An indexed parachain belonging to and operated by the context.
 	///