Add note provenance filter support to SubscriptionManager

Closes: https://github.com/damus-io/damus/issues/3222
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>

damus/Core/Networking/NostrNetworkManager/SubscriptionManager.swift

@@ -137,7 +137,13 @@ extension NostrNetworkManager {
                             case .event(let noteKey):
                                 let lender = NdbNoteLender(ndb: self.ndb, noteKey: noteKey)
                                 try Task.checkCancellation()
-                                continuation.yield(.event(lender: lender))
+                                guard let desiredRelays else {
+                                    continuation.yield(.event(lender: lender))  // If no desired relays are specified, return all notes we see.
+                                    break
+                                }
+                                if try ndb.was(noteKey: noteKey, seenOnAnyOf: desiredRelays) {
+                                    continuation.yield(.event(lender: lender))  // If desired relays were specified and this note was seen there, return it.
+                                }
                             }
                         }
                     }

damus/Core/Nostr/RelayPool.swift

@@ -141,7 +141,7 @@ class RelayPool {
                   case .string(let str) = msg
             else { return }
 
-            let _ = self.ndb.process_event(str)
+            let _ = self.ndb.process_event(str, originRelayURL: relay_id)
             self.message_received_function?((str, desc))
         })
         let relay = Relay(descriptor: desc, connection: conn)