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.

bizinikiwi/client/utils/src/notification.rs

@@ -0,0 +1,121 @@
+// This file is part of Bizinikiwi.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Provides mpsc notification channel that can be instantiated
+//! _after_ it's been shared to the consumer and producers entities.
+//!
+//! Useful when building RPC extensions where, at service definition time, we
+//! don't know whether the specific interface where the RPC extension will be
+//! exposed is safe or not and we want to lazily build the RPC extension
+//! whenever we bind the service to an interface.
+//!
+//! See [`sc-service::builder::RpcExtensionBuilder`] for more details.
+
+use futures::stream::{FusedStream, Stream};
+use std::{
+	pin::Pin,
+	task::{Context, Poll},
+};
+
+use crate::pubsub::{Hub, Receiver};
+
+mod registry;
+use registry::Registry;
+
+#[cfg(test)]
+mod tests;
+
+/// Trait used to define the "tracing key" string used to tag
+/// and identify the mpsc channels.
+pub trait TracingKeyStr {
+	/// Const `str` representing the "tracing key" used to tag and identify
+	/// the mpsc channels owned by the object implementing this trait.
+	const TRACING_KEY: &'static str;
+}
+
+/// The receiving half of the notifications channel.
+///
+/// The [`NotificationStream`] entity stores the [`Hub`] so it can be
+/// used to add more subscriptions.
+#[derive(Clone)]
+pub struct NotificationStream<Payload, TK: TracingKeyStr> {
+	hub: Hub<Payload, Registry>,
+	_pd: std::marker::PhantomData<TK>,
+}
+
+/// The receiving half of the notifications channel(s).
+#[derive(Debug)]
+pub struct NotificationReceiver<Payload> {
+	receiver: Receiver<Payload, Registry>,
+}
+
+/// The sending half of the notifications channel(s).
+pub struct NotificationSender<Payload> {
+	hub: Hub<Payload, Registry>,
+}
+
+impl<Payload, TK: TracingKeyStr> NotificationStream<Payload, TK> {
+	/// Creates a new pair of receiver and sender of `Payload` notifications.
+	pub fn channel() -> (NotificationSender<Payload>, Self) {
+		let hub = Hub::new(TK::TRACING_KEY);
+		let sender = NotificationSender { hub: hub.clone() };
+		let receiver = NotificationStream { hub, _pd: Default::default() };
+		(sender, receiver)
+	}
+
+	/// Subscribe to a channel through which the generic payload can be received.
+	pub fn subscribe(&self, queue_size_warning: usize) -> NotificationReceiver<Payload> {
+		let receiver = self.hub.subscribe((), queue_size_warning);
+		NotificationReceiver { receiver }
+	}
+}
+
+impl<Payload> NotificationSender<Payload> {
+	/// Send out a notification to all subscribers that a new payload is available for a
+	/// block.
+	pub fn notify<Error>(
+		&self,
+		payload: impl FnOnce() -> Result<Payload, Error>,
+	) -> Result<(), Error>
+	where
+		Payload: Clone,
+	{
+		self.hub.send(payload)
+	}
+}
+
+impl<Payload> Clone for NotificationSender<Payload> {
+	fn clone(&self) -> Self {
+		Self { hub: self.hub.clone() }
+	}
+}
+
+impl<Payload> Unpin for NotificationReceiver<Payload> {}
+
+impl<Payload> Stream for NotificationReceiver<Payload> {
+	type Item = Payload;
+
+	fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Payload>> {
+		Pin::new(&mut self.get_mut().receiver).poll_next(cx)
+	}
+}
+
+impl<Payload> FusedStream for NotificationReceiver<Payload> {
+	fn is_terminated(&self) -> bool {
+		self.receiver.is_terminated()
+	}
+}