feat: add missing message handlers

src/message/server/parent_min_speed.rs

@@ -0,0 +1,20 @@
+use std::sync::mpsc::Sender;
+
+use crate::{
+    message::{Message, MessageHandler},
+    server::ServerOperation,
+};
+
+pub struct ParentMinSpeedHandler;
+
+impl MessageHandler for ParentMinSpeedHandler {
+    fn get_code(&self) -> u8 {
+        83
+    }
+
+    fn handle(&self, message: &mut Message, sender: Sender<ServerOperation>) {
+        let _ = sender;
+        let number = message.read_int32();
+        println!("Parent min speed: {}", number);
+    }
+}