easy tcp udp network

anet is a lightweight, high-performance networking package written in Go. It provides an efficient and flexible foundation for building networked applications such as servers, proxies, and custom network protocols. Designed with extensibility and ease of use in mind, anet offers essential abstractions for connection management

封装 net，提供简单易用接口。使得业务层能面向 session 编程，同时支持 HiJack 获取底层 connection。