fix: Convert vendor/pezkuwi-subxt from submodule to regular directory

vendor/pezkuwi-subxt/lightclient/src/shared_client.rs

@@ -0,0 +1,47 @@
+// Copyright 2019-2025 Parity Technologies (UK) Ltd.
+// This file is dual-licensed as Apache-2.0 or GPL-3.0.
+// see LICENSE for license details.
+
+use smoldot_light as sl;
+use std::sync::{Arc, Mutex};
+
+/// This wraps [`smoldot_light::Client`] so that it can be cloned and shared.
+#[derive(Clone)]
+pub struct SharedClient<TPlat: sl::platform::PlatformRef, TChain = ()> {
+    client: Arc<Mutex<sl::Client<TPlat, TChain>>>,
+}
+
+impl<TPlat: sl::platform::PlatformRef, TChain> From<sl::Client<TPlat, TChain>>
+    for SharedClient<TPlat, TChain>
+{
+    fn from(client: sl::Client<TPlat, TChain>) -> Self {
+        SharedClient {
+            client: Arc::new(Mutex::new(client)),
+        }
+    }
+}
+
+impl<TPlat: sl::platform::PlatformRef, TChain> SharedClient<TPlat, TChain> {
+    /// Delegates to [`smoldot_light::Client::json_rpc_request()`].
+    pub(crate) fn json_rpc_request(
+        &self,
+        json_rpc_request: impl Into<String>,
+        chain_id: sl::ChainId,
+    ) -> Result<(), sl::HandleRpcError> {
+        self.client
+            .lock()
+            .expect("mutex should not be poisoned")
+            .json_rpc_request(json_rpc_request, chain_id)
+    }
+
+    /// Delegates to [`smoldot_light::Client::add_chain()`].
+    pub(crate) fn add_chain(
+        &self,
+        config: sl::AddChainConfig<'_, TChain, impl Iterator<Item = sl::ChainId>>,
+    ) -> Result<sl::AddChainSuccess<TPlat>, sl::AddChainError> {
+        self.client
+            .lock()
+            .expect("mutex should not be poisoned")
+            .add_chain(config)
+    }
+}