feat(client): add specific warning kinds for dropped packets

crates/irtt-client/src/event.rs

@@ -77,10 +77,18 @@ pub enum ClientEvent {
     },
 
     Warning {
+        kind: WarningKind,
         message: String,
     },
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum WarningKind {
+    MalformedOrUnrelatedPacket,
+    WrongToken,
+    UntrackedReply,
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub struct RttSample {
     pub raw: Duration,