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/metadata/benches/bench.rs

@@ -11,7 +11,7 @@ use pezkuwi_subxt_metadata::Metadata;
 use std::{fs, path::Path};
 
 fn load_metadata() -> Metadata {
-	let bytes = fs::read(Path::new("../artifacts/pezkuwi_metadata_full.scale"))
+	let bytes = fs::read(Path::new("../artifacts/polkadot_metadata_full.scale"))
 		.expect("Cannot read metadata blob");
 	let meta: RuntimeMetadataPrefixed =
 		Decode::decode(&mut &*bytes).expect("Cannot decode scale metadata");