feat: add login_start packet parsing for username extraction

src/mc_server.rs

@@ -42,14 +42,12 @@ pub async fn complete_status_request(
 /// Disconnects the client.
 ///
 /// It works if the client is in the login state, and it
-/// has *already* and *only* sent the handshake packet.
+/// has *already* and *only* sent the **handshake** and **login_start** packet.
 #[tracing::instrument(skip(client_stream))]
 pub async fn send_disconnect(
     client_stream: &mut TcpStream,
     reason: &str,
 ) -> Result<(), OpaqueError> {
-    let _client_packet = Packet::parse(client_stream).await?;
-
     let disconnect_packet =
         crate::packets::clientbound::login::Disconnect::set_reason(reason.to_owned())
             .await