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

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

@@ -0,0 +1,23 @@
+#![allow(missing_docs)]
+use subxt::ext::codec::{Compact, Decode};
+use subxt::ext::frame_metadata::RuntimeMetadataPrefixed;
+use subxt::{OnlineClient, PolkadotConfig};
+
+#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
+pub mod polkadot {}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Create a client to use:
+    let api = OnlineClient::<PolkadotConfig>::new().await?;
+
+    // Use runtime APIs at the latest block:
+    let runtime_apis = api.runtime_api().at_latest().await?;
+
+    // Ask for metadata and decode it:
+    let result_bytes = runtime_apis.call_raw("Metadata_metadata", None).await?;
+    let (_, meta): (Compact<u32>, RuntimeMetadataPrefixed) = Decode::decode(&mut &*result_bytes)?;
+
+    println!("{meta:?}");
+    Ok(())
+}