refactor: optimize websocket server

Signed-off-by: MiaoWoo <admin@yumc.pw>

packages/websocket/src/socket-io/index.ts

@@ -4,8 +4,6 @@ import { ServerEvent } from './constants'
 import { Namespace } from './namespace'
 import { Client } from './client'
 import { Parser } from './parser'
-import { PacketTypes, SubPacketTypes } from './types'
-import { Packet } from './packet'
 import { Socket } from './socket'
 import { Adapter } from './adapter'
 import { Transport } from '../transport'