feat: Vendor pezkuwi-subxt and pezkuwi-zombienet-sdk into monorepo

- Add pezkuwi-subxt crates to vendor/pezkuwi-subxt
- Add pezkuwi-zombienet-sdk crates to vendor/pezkuwi-zombienet-sdk
- Convert git dependencies to path dependencies
- Add vendor crates to workspace members
- Remove test/example crates from vendor (not needed for SDK)
- Fix feature propagation issues detected by zepter
- Fix workspace inheritance for internal dependencies
- All 606 crates now in workspace
- All 6919 internal dependency links verified correct
- No git dependencies remaining

vendor/pezkuwi-subxt/subxt/examples/setup_rpc_chainhead_backend.rs

@@ -0,0 +1,39 @@
+//! Example to utilize the ChainHeadBackend rpc backend to subscribe to finalized blocks.
+
+#![allow(missing_docs)]
+
+use futures::StreamExt;
+use pezkuwi_subxt::{
+	OnlineClient, PezkuwiConfig,
+	backend::{
+		chain_head::{ChainHeadBackend, ChainHeadBackendBuilder},
+		rpc::RpcClient,
+	},
+};
+
+// Generate an interface that we can use from the node's metadata.
+#[pezkuwi_subxt::subxt(runtime_metadata_path = "../artifacts/pezkuwi_metadata_small.scale")]
+pub mod pezkuwi {}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+	tracing_subscriber::fmt::init();
+
+	let rpc = RpcClient::from_url("ws://localhost:9944".to_string()).await?;
+	let backend: ChainHeadBackend<PezkuwiConfig> =
+		ChainHeadBackendBuilder::default().build_with_background_driver(rpc.clone());
+	let api = OnlineClient::from_backend(std::sync::Arc::new(backend)).await?;
+
+	let mut blocks_sub = api.blocks().subscribe_finalized().await?.take(100);
+
+	while let Some(block) = blocks_sub.next().await {
+		let block = block?;
+
+		let block_number = block.number();
+		let block_hash = block.hash();
+
+		println!("Block #{block_number} ({block_hash})");
+	}
+
+	Ok(())
+}