Add temporary typing indicator impl.

src/notifications/events.rs

@@ -26,6 +26,12 @@ pub enum WebSocketError {
 #[serde(tag = "type")]
 pub enum ServerboundNotification {
     Authenticate(Session),
+    BeginTyping {
+        channel: String
+    },
+    EndTyping {
+        channel: String
+    }
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -63,6 +69,14 @@ pub enum ClientboundNotification {
     ChannelDelete {
         id: String,
     },
+    ChannelStartTyping {
+        id: String,
+        user: String
+    },
+    ChannelStopTyping {
+        id: String,
+        user: String
+    },
 
     UserRelationship {
         id: String,