feat: add shared codegen support

package.json

@@ -1,6 +1,6 @@
 {
   "name": "com.cneicy.shrink-network",
-  "version": "0.2.1",
+  "version": "0.3.0",
   "displayName": "ShrinkNetwork",
   "description": "面向 Unity 的轻量网络框架，提供会话、消息注册、RPC、权限控制，以及 TCP/KCP 传输抽象。",
   "unity": "2022.3",