Abstract Pdu filter matching into trait Event.

Abstract Pdu unsigned accessors into trait Event.

Abstract Pdu relation related into trait Event.

Abstract PDU content into trait Event.

Move event_id utils from pdu to event.

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/sending/sender.rs

@@ -842,7 +842,7 @@ impl Service {
 			let unread: UInt = self
 				.services
 				.user
-				.notification_count(&user_id, &pdu.room_id)
+				.notification_count(&user_id, pdu.room_id())
 				.await
 				.try_into()
 				.expect("notification count can't go that high");