protocol: Implement PacketType for Packet.

protocol/src/protocol/mod.rs

@@ -90,6 +90,32 @@ macro_rules! state_packets {
         )+
         }
 
+        impl PacketType for Packet {
+            fn packet_id(&self, version: i32) -> i32 {
+                match self {
+                $(
+                    $(
+                        $(
+                Self::$name(p) => p.packet_id(version),
+                        )*
+                    )+
+                )+
+                }
+            }
+
+            fn write<W: io::Write>(&self, buf: &mut W) -> Result<(), Error> {
+                match self {
+                $(
+                    $(
+                        $(
+                Self::$name(p) => p.write(buf),
+                        )*
+                    )+
+                )+
+                }
+            }
+        }
+
         $(
         pub mod $state {