feat: Rebrand Polkadot/Substrate references to PezkuwiChain

This commit systematically rebrands various references from Parity Technologies'
Polkadot/Substrate ecosystem to PezkuwiChain within the kurdistan-sdk.

Key changes include:
- Updated external repository URLs (zombienet-sdk, parity-db, parity-scale-codec, wasm-instrument) to point to pezkuwichain forks.
- Modified internal documentation and code comments to reflect PezkuwiChain naming and structure.
- Replaced direct references to  with  or specific paths within the  for XCM, Pezkuwi, and other modules.
- Cleaned up deprecated  issue and PR references in various  and  files, particularly in  and  modules.
- Adjusted image and logo URLs in documentation to point to PezkuwiChain assets.
- Removed or rephrased comments related to external Polkadot/Substrate PRs and issues.

This is a significant step towards fully customizing the SDK for the PezkuwiChain ecosystem.

docs/sdk/src/reference_docs/metadata.rs

@@ -1,7 +1,7 @@
 //! # Metadata
 //!
 //! The existence of metadata in pezkuwi-sdk goes back to the (forkless) upgrade-ability of all
-//! Substrate-based blockchains, which is achieved through
+//! Bizinikiwi-based blockchains, which is achieved through
 //! [`crate::reference_docs::wasm_meta_protocol`]. You can learn more about the details of how to
 //! deal with these upgrades in [`crate::reference_docs::frame_runtime_upgrades_and_migrations`].
 //!
@@ -9,7 +9,7 @@
 //! it is hard to know the types internal to the runtime, specifically in light of the fact that
 //! they can change at any point in time.
 //!
-//! This is why all Substrate-based runtimes must expose a [`sp_api::Metadata`] api, which mandates
+//! This is why all Bizinikiwi-based runtimes must expose a [`pezsp_api::Metadata`] api, which mandates
 //! the runtime to return a description of itself. The return type of this api is `Vec<u8>`, meaning
 //! that it is up to the runtime developer to decide on the format of this.
 //!