docs: add release notes for RedisSMQ v8

See https://github.com/weyoss/redis-smq/tree/master/release-notes/release-v8.md

Author: Weyoss

release-notes/release-v8.md

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+
+# RedisSMQ V8 Release Notes
+
+## Overview
+RedisSMQ v8 represents a major evolution of our message queue system, with significant improvements to architecture, performance, and developer experience. This release focuses on reliability, scalability, and modern development practices.
+
+## Table of Contents
+- [Overview](#overview)
+- [New Features](#new-features)
+- [Improvements](#improvements)
+- [Breaking Changes](#breaking-changes)
+- [Compatibility](#compatibility)
+- [Documentation](#documentation)
+
+## New Features
+
+### Core Architecture
+- **Reworked System Design**: Refactored the message queue core codebase to support multiple message types and delivery models with focus on reliability and scalability
+- **Queue-Scoped Workers**: Replaced global workers with queue-scoped workers for better resource allocation and management
+- **Migration to Monorepo**: Restructured into a monorepo architecture for improved package organization, dependency management, and development workflow
+
+### Messaging
+- **Pub/Sub Delivery Model**: Implemented a publish/subscribe pattern alongside existing queue models, enabling broadcast messaging to multiple consumers
+- **Message Tracking System**: Added comprehensive message lifecycle tracking with unique IDs from publication to consumption
+- **Message Envelope Architecture**: Redesigned with `ProducibleMessage`/`ConsumableMessage`/`MessageEnvelope` for clearer separation of concerns
+
+### API
+- **Enhanced Message Status API**: Introduced `getMessageStatus()` method and status tracking for improved visibility into message processing
+- **REST API Integration**: Created a comprehensive REST API with OpenAPI specification for managing queues and messages
+
+### Tools
+- **Embedded Redis Server**: Integrated an embedded Redis server for streamlined development and testing
+
+## Improvements
+
+### Performance & Reliability
+- **LUA-Based Operations**: Migrated Redis operations to LUA scripts for atomic execution, improved performance, and data consistency
+- **Worker Threads**: Added support for isolating message handlers in separate worker threads to prevent blocking the main event loop
+- **Async Error Handling**: Implemented robust error handling patterns for asynchronous operations
+
+### Developer Experience
+- **Enhanced TypeScript Definitions**: Improved type definitions throughout the codebase for better IDE integration and compile-time checks
+- **Unified Event System**: Consolidated consumer/producer event listeners into a consistent, predictable API
+- **Typed Events**: Implemented TypeScript event types for improved type safety and developer experience
+- **Granular Error Handling**: Developed specialized error classes for precise error reporting and handling
+- **PNPM Package Manager**: Replaced NPM with PNPM for faster, more efficient package management
+
+### Code Quality
+- **Code Structure Optimization**: Refactored for improved readability, maintainability, and adherence to best practices
+- **Standardized Patterns**: Implemented consistent design patterns throughout the codebase
+- **Enhanced Testing Framework**: Migrated to vitest framework for more effective testing
+
+## Breaking Changes
+- **API Changes**: Several API changes require updates to existing code
+- **Data Structure Compatibility**: Redis data structures are NOT compatible with v7.x
+
+## Compatibility
+- **Node.js Compatibility**: Supports Node.js v20 and above, with full testing on v20 and v22
+- **Redis Compatibility**: Supports Redis v4 and above, with full testing on v7.2.8
+
+## Documentation
+- **Interactive API Documentation**: Completely revamped API documentation with interactive examples and detailed explanations
+- **Architectural Diagrams**: Added new system architecture, message flow, and component interaction diagrams