Don't disconnect on unknown packet (#39)

When an unknown packet is received instead of dropping the connection,
send a debug message with the connection state and packet payload.


![image](https://github.com/arciera/server/assets/66572326/d8a3b70a-e1f1-42d8-b8c8-fb39aa0e9ef8)

index.ts

@@ -1,6 +1,7 @@
 import Config from "./src/Config.js";
 import Server from "./src/Server.js";
 import LoginSuccessPacket from "./src/packet/server/LoginSuccessPacket.js";
+import Connection from "./src/Connection.js";
 
 const config: Config = await Config.fromFile("config.json");
 
@@ -9,8 +10,7 @@ server.start();
 server.on("listening", (port) => server.logger.info(`Listening on port ${port}`));
 
 server.on("unknownPacket", (packet, conn) => {
-    server.logger.warn("Unknown packet, disconnecting", packet.dataBuffer);
-    conn.disconnect().then();
+    server.logger.debug("Unknown packet", `{state=${Connection.State[conn.state]}}`, packet.dataBuffer);
 });
 server.on("packet", (packet, _conn) => {
     server.logger.debug(packet.constructor.name, packet.data);