network: Broadcast quoted notes when posting a note with quotes

This change addresses an issue where notes with quotes sometimes are not loaded correctly because the quoted note was not available in the same relay. Now whenever a user posts a note with a quoted note, the quoted note is also broadcast to the user's selected relays.

Issue repro
-----------

ISSUE REPRODUCED

Device: iPhone 14 Pro Simulator
iOS: 17.0
Damus: `1fabd4c0fe98d1f47b1fa0f76984ad78095bd49c`
Setup:
- Make sure you have a debugger connected
- Have a test note that you can quote

Steps:

1. Start Damus and let logs settle
2. Observe where the last log is
3. Quote the test note
4. Copy newly generated logs and paste on a text editor.
5. Analyze those logs. Pay attention to the new note id, as well as the note id of the quoted event (`["q", <QUOTED_NOTE_ID>]`)

Results: Logs show that the newly posted event is being flushed to the relays, but not the note that is being quoted.

Testing of the fix
------------------

PASS

Device: iPhone 14 Pro Simulator
iOS: 17.0
Damus: This commit
Setup:
- Make sure you have a debugger connected
- Have a test note that you can quote

Steps:

1. Start Damus and let logs settle
2. Observe where the last log is
3. Quote the test note
4. Copy newly generated logs and paste on a text editor.
5. Analyze those logs. Pay attention to the new note id, as well as the note id of the quoted event (`["q", <QUOTED_NOTE_ID>]`)

Results:
- Logs show the new event being flushed to the relays. PASS
- Logs show the quoted event also being flushed to the relays. PASS

Closes: https://github.com/damus-io/damus/issues/1495
Changelog-Fixed: Broadcast quoted notes when posting a note with quotes
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
Reviewed-by: William Casarin <jb55@jb55.com>
Signed-off-by: William Casarin <jb55@jb55.com>

damus/ContentView.swift

@@ -987,6 +987,12 @@ func handle_post_notification(keypair: FullKeypair, postbox: PostBox, events: Ev
                 postbox.send(ev)
             }
         }
+        for qref in new_ev.referenced_quote_ids.prefix(3) {
+            // also broadcast at most 3 referenced quoted events
+            if let ev = events.lookup(qref.note_id) {
+                postbox.send(ev)
+            }
+        }
         return true
     case .cancel:
         print("post cancelled")