ffi: Correct timestamp value and remove is_read flag

The timestamp value of the Notification was not reliable since it was the
timestamp in which it was generated internally, not the timestamp of when the
event was sent, now we instead expose the `origin_server_ts` of the
TimelineEvent.

`is_read` is also very unreliable, so it's just removed for now.

bindings/matrix-sdk-ffi/src/api.udl

@@ -22,8 +22,6 @@ dictionary NotificationItem {
     boolean is_noisy;
     boolean is_direct;
     boolean is_encrypted;
-    boolean is_read;
-    u64 timestamp;
 };
 
 interface TimelineEvent {};

bindings/matrix-sdk-ffi/src/event.rs

@@ -19,6 +19,10 @@ impl TimelineEvent {
         self.0.sender().to_string()
     }
 
+    pub fn timestamp(&self) -> u64 {
+        self.0.origin_server_ts().0.into()
+    }
+
     pub fn event_type(&self) -> Result<TimelineEventType, ClientError> {
         let event_type = match &self.0 {
             AnySyncTimelineEvent::MessageLike(event) => {

bindings/matrix-sdk-ffi/src/notification_service.rs

@@ -18,9 +18,6 @@ pub struct NotificationItem {
     pub is_noisy: bool,
     pub is_direct: bool,
     pub is_encrypted: bool,
-    pub is_read: bool,
-
-    pub timestamp: u64,
 }
 
 impl NotificationItem {
@@ -48,8 +45,6 @@ impl NotificationItem {
             is_noisy,
             is_direct: room.is_direct().await?,
             is_encrypted: room.is_encrypted().await?,
-            is_read: notification.read,
-            timestamp: notification.ts.0.into(),
         };
         Ok(item)
     }