Implement timestamp-based network subscription optimization

Changelog-Changed: Optimized network bandwidth usage and improved timeline performance
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damus/Core/Nostr/RelayConnection.swift

@@ -35,6 +35,15 @@ enum NostrConnectionEvent {
             }
         }
     }
+    
+    var subId: String? {
+        switch self {
+        case .ws_connection_event(_):
+            return nil
+        case .nostr_event(let event):
+            return event.subid
+        }
+    }
 }
 
 final class RelayConnection: ObservableObject {

damus/Core/Nostr/RelayPool.swift

@@ -535,6 +535,8 @@ actor RelayPool {
         }
 
         for handler in handlers {
+            guard handler.sub_id == event.subId else { continue }
+            logStreamPipelineStats("RelayPool_\(relay_id.absoluteString)", "RelayPool_Handler_\(handler.sub_id)")
             handler.handler.yield((relay_id, event))
         }
     }