feat(xcm): support json schema (for CosmWasm VM support) (#1454)

# Description

- What does this PR do? Allows to generate JSON schema for subset of XCM
in std builds
- Why are these changes needed? To support XCM messages in CosmWasm
contracts which require Schemars to generate contract clients
- How were these changes implemented and what do they affect? We will
use schema feature flag to build XCM pallet with JSON schema enabled

# Checklist

- [x] My PR includes a detailed description as outlined in the
"Description" section above
- [x] My PR follows the [labeling requirements](CONTRIBUTING.md#Process)
of this project (at minimum one label for `T`
  required)
- [x] I have made corresponding changes to the documentation (if
applicable)
- [x] I have added tests that prove my fix is effective or that my
feature works (if applicable)
- [x] If this PR alters any external APIs or interfaces used by
Polkadot, the corresponding Polkadot PR is ready as well
  as the corresponding Cumulus PR (optional)

substrate/primitives/weights/Cargo.toml

@@ -21,6 +21,7 @@ smallvec = "1.11.0"
 sp-arithmetic = { path = "../arithmetic", default-features = false }
 sp-debug-derive = { path = "../debug-derive", default-features = false }
 sp-std = { path = "../std", default-features = false }
+schemars = { version = "0.8.3", default-features = false, optional = true }
 
 [features]
 default = ["std"]
@@ -44,3 +45,7 @@ serde = [
 	"scale-info/serde",
 	"sp-arithmetic/serde",
 ]
+
+json-schema = [
+	"dep:schemars",
+]

substrate/primitives/weights/src/weight_v2.rs

@@ -23,6 +23,7 @@ use super::*;
 
 #[derive(Encode, Decode, MaxEncodedLen, TypeInfo, Eq, PartialEq, Copy, Clone, Debug, Default)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "json-schema", derive(schemars::JsonSchema))]
 pub struct Weight {
 	#[codec(compact)]
 	/// The weight of computational time used based on some reference hardware.