[iOS] Re-add tab event handlers for metadata fetch

This partially reverts a change in #24376 which removed a set of TabEventHandler's

Author: kylehickinson

ios/brave-ios/Sources/Brave/Frontend/Browser/TabManager.swift

@@ -47,6 +47,7 @@ class WeakTabManagerDelegate {
 // TabManager must extend NSObjectProtocol in order to implement WKNavigationDelegate
 class TabManager: NSObject {
   fileprivate var delegates = [WeakTabManagerDelegate]()
+  fileprivate let tabEventHandlers: [TabEventHandler]
   weak var stateDelegate: TabManagerStateDelegate?
 
   /// Internal url to access the new tab page.
@@ -130,6 +131,7 @@ class TabManager: NSObject {
     self.tabGeneratorAPI = tabGeneratorAPI
     self.historyAPI = historyAPI
     self.privateBrowsingManager = privateBrowsingManager
+    self.tabEventHandlers = TabEventHandlers.create(with: prefs)
     super.init()
 
     self.navDelegate.tabManager = self

ios/brave-ios/Sources/Brave/Helpers/TabEventHandlers.swift

@@ -0,0 +1,17 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+import Foundation
+import Shared
+
+class TabEventHandlers {
+  static func create(with prefs: Prefs) -> [TabEventHandler] {
+    return [
+      FaviconHandler(),
+      UserActivityHandler(),
+      MetadataParserHelper(),
+      MediaImageLoader(prefs),
+    ]
+  }
+}