[docs] Add changelog

Author: chuandew

CHANGELOG.md

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+# DINGOFS Change Log
+All notable changes to this project are documented in this file.
+
+## [5.0.0]
+
+**Client**
+- Complete redesign and reimplementation of the client architecture
+- Support for seamless FUSE upgrades without service interruption
+- New monitoring dashboard integrated into the client interface
+- Added caching capabilities for dentry, inode, and chunk metadata
+- Supports S3 and Ceph Rados as persistent storage
+    
+**BlockCache**
+- Introduced distributed caching system
+- Added asynchronous operation interfaces to the cache system, enhancing I/O concurrency
+- Integrated `io_uring` support for high-efficiency file read/write operations, reducing system call overhead
+   
+**Metadata Service (MDS)**
+- The Metadata Service (MDS) has been completely refactored with full support for POSIX semantics
+- Support for both Mono (single-partition) and Hash partition strategies for metadata distribution
+- Implementation of distributed locking mechanism
+- Built-in fault recovery capabilities
+- Support for filesystem-level and directory-level quotas
+- Internal operational status visualization for improved maintenance and debugging
+- Automatic compression and organization of chunks
+- Backup and restore functionality for filesystem metadata
+- Dynamic addition and removal of MDS nodes
+- Support for dingo-store as backend metadata storage engine
+- Unified management of distributed cache nodes
+
+**Monitoring & Observability**
+- Native integration with Grafana and Prometheus for comprehensive monitoring
+- Added monitoring for distributed cache and new metadata services
+- New tracing module implemented

CHANGELOG_CN.md

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+# DINGOFS 变更日志
+此项目所有重要的变更皆记录于此文件中
+
+## [5.0.0]
+
+**客户端 (Client)**
+- 客户端重新设计实现
+- 客户端支持 FUSE 平滑升级
+- 客户端新增监控面板
+- 客户端支持缓存 dentry/inode/chunk 元数据
+- 支持 S3 和 Ceph Rados 作为持久化存储
+
+**缓存 (BlockCache)**
+- 新增分布式缓存
+- 缓存系统新增异步操作接口，提高 I/O 并发处理能力
+- 缓存系统集成 `io_uring`，支持高效的文件读写操作，降低系统调用开销
+
+**元数据服务 (MDS)**
+- 元数据服务（MDS）彻底重构，完整支持 POSIX 语义
+- 支持 Mono (单分区) 和 Hash (哈希分区) 两种元数据分布策略
+- 支持分布式锁机制
+- 支持故障恢复
+- 支持文件系统级和目录级的配额
+- 支持内部运行状态可视化功能，便于运维与调试
+- 支持 chunk 的自动压缩与整理
+- 支持文件系统元数据的备份与恢复功能
+- 支持元数据节点的动态加入与退出
+- 支持 dingo-store 作为后端元数据存储引擎
+- 支持对分布式缓存节点的统一管理
+
+**监控与可观测性 (Monitoring & Observability)**
+- 支持集成 Grafana 和 Prometheus 进行监控
+- 新增分布式缓存监控及新版元数据监控
+- 新增追踪模块