暂时保存 pikiwidb-proxy 的设计

Walkthrough

此次更改涉及多个文件的新增和修改，主要包括引入了 PikiwiProxy 项目的构建配置，定义了与后端数据库 pikiwidb 进行通信的类，以及实现了 Redis 任务处理的相关功能。此外，多个新类的创建促进了系统的模块化，增强了代码的可维护性和扩展性。

Changes

文件	更改概要
`CMakeLists.txt`	格式调整，条件语句前后空格和缩进优化。
`src/proxy/CmakeLists.txt`	新增构建配置文件，定义了 `PikiwiProxy` 的目标和依赖。
`src/proxy/backend.h`	新增 `Backend` 类，负责与 `pikiwidb` 的 TCP 连接管理。
`src/proxy/backend_manager.h`	新增 `BackendManager` 类，管理后端操作的生命周期。
`src/proxy/brpc_redis.cc`	新增 `BrpcRedis` 类，处理 Redis 任务的队列和提交。
`src/proxy/brpc_redis.h`	新增 `BrpcRedis` 接口，定义 Redis 客户端功能。
`src/proxy/docs/PikaProxy_zh.md`	新增文档，详细描述 PikaProxy 系统及其架构。
`src/proxy/pd_client.h`	新增 `PdClient` 类，作为未来开发的占位符。
`src/proxy/proxy.cc`	新增 `PProxy` 类，实现代理的单例模式及基本方法。
`src/proxy/proxy.h`	新增 `PProxy` 类，定义代理管理的核心功能和成员变量。
`src/proxy/proxy_client.h`	新增 `ProxyClient` 类，管理 TCP 连接。
`src/proxy/proxy_io_thread_pool.h`	新增 `ProxyIOThreadPool` 类，处理代理特定的 IO 事件。
`src/proxy/redis.h`	新增 `Redis` 抽象类，定义 Redis 客户端接口。
`src/proxy/redis_task.h`	新增 `RedisTask` 抽象类，为 Redis 操作任务提供基类。
`src/proxy/router.h`	新增 `Router` 抽象类，管理任务路由的基础接口。

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant PProxy
    participant BackendManager
    participant Backend
    participant BrpcRedis

    Client->>PProxy: Send Command
    PProxy->>BackendManager: Route Command
    BackendManager->>Backend: Establish Connection
    Backend->>BrpcRedis: Process Redis Task
    BrpcRedis->>Backend: Return Result
    BackendManager->>PProxy: Forward Result
    PProxy->>Client: Send Response

🐰 兔子跳跃，变化新奇，
代码整齐如春风吹，
PikiwiProxy 与 Redis 共舞，
数据流转，欢喜无比！
期待未来更精彩，
兔子跃起，心飞扬！
🐇✨

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OpenAtomFoundation / pikiwidb