move fetch metadata to a separate crate subxt_utils_fetchmetadata (#1829)

* macros: feature-gate jsonrpsee/fetch metadata url

* make CI happy

* Update codegen/src/error.rs

* extract `fetch-metdata` to separate crate

* add missing license headers

* introduce subxt-utils crate

* add missing files

* codegen: remove unused hex crate

* fix test build

* move subxt_utils -> subxt_utils_fetchmetadata

* cargo fmt

* runtime-path -> runtime-metadata-path

* Update utils/fetch-metadata/src/lib.rs

cli/src/commands/chain_spec/fetch.rs

@@ -9,7 +9,7 @@ use jsonrpsee::{
     http_client::HttpClientBuilder,
 };
 use std::time::Duration;
-use subxt_codegen::fetch_metadata::Url;
+use subxt_utils_fetchmetadata::Url;
 
 /// Returns the node's chainSpec from the provided URL.
 pub async fn fetch_chain_spec(url: Url) -> Result<serde_json::Value, FetchSpecError> {

cli/src/commands/chain_spec/mod.rs

@@ -6,7 +6,7 @@ use clap::Parser as ClapParser;
 #[cfg(feature = "chain-spec-pruning")]
 use serde_json::Value;
 use std::{io::Write, path::PathBuf};
-use subxt_codegen::fetch_metadata::Url;
+use subxt_utils_fetchmetadata::Url;
 
 mod fetch;
 

cli/src/commands/compatibility.rs

@@ -8,8 +8,8 @@ use color_eyre::eyre::WrapErr;
 use jsonrpsee::client_transport::ws::Url;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
-use subxt_codegen::fetch_metadata::MetadataVersion;
 use subxt_metadata::Metadata;
+use subxt_utils_fetchmetadata::MetadataVersion;
 
 use crate::utils::validate_url_security;
 
@@ -137,7 +137,7 @@ async fn fetch_runtime_metadata(
     url: Url,
     version: MetadataVersion,
 ) -> color_eyre::Result<Metadata> {
-    let bytes = subxt_codegen::fetch_metadata::fetch_metadata_from_url(url, version).await?;
+    let bytes = subxt_utils_fetchmetadata::from_url(url, version).await?;
     let metadata = Metadata::decode(&mut &bytes[..])?;
     Ok(metadata)
 }