fix: resolve cargo-clippy CI errors in vendor crates

- Fix rebrand issues in pezkuwi-subxt signer (sp_core -> pezsp_core,
  sp_keyring -> pezsp_keyring, sp_runtime -> pezsp_runtime)
- Fix pezkuwi-zombienet-sdk tests (subxt::PolkadotConfig ->
  pezkuwi_subxt::PezkuwiConfig)
- Correct artifact paths in subxt examples (polkadot_metadata_*.scale)
- Fix type conversion issues in subxt examples (explicit constructors
  instead of .into() for generated types)
- Add pezkuwi-subxt-utils-stripmetadata dev-dependency to metadata crate
- Use original polkadot module from external frame-decode crate
- Fix Display trait usage for generated AccountId32 types

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

@@ -21,7 +21,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 	// 3. Metadata (I'll load it from the downloaded metadata, but you can use `subxt metadata >
 	//    file.scale` to download it):
 	let metadata = {
-		let bytes = std::fs::read("./artifacts/pezkuwi_metadata_small.scale").unwrap();
+		let bytes = std::fs::read("./artifacts/polkadot_metadata_small.scale").unwrap();
 		Metadata::decode(&mut &*bytes).unwrap()
 	};