AI Chat config changes (#1103)

**Required**:

Task/Issue URL:
https://app.asana.com/0/1204167627774280/1208839072951136/f
iOS PR: duckduckgo/iOS#3645
macOS PR: duckduckgo/macos-browser#3610
What kind of version bump will this require?: Minor

**Optional**:

Tech Design URL:
CC:

**Description**:
Adds 2 new feature for iOS AI Chat integration

Sources/BrowserServicesKit/PrivacyConfig/Features/PrivacyFeature.swift

@@ -106,11 +106,17 @@ public enum AIChatSubfeature: String, Equatable, PrivacySubfeature {
         .aiChat
     }
 
-    /// Displays the settings item for showing a shortcut in the Application Menu
+    /// Displays the settings item for showing a shortcut in the macOS application menu.
     case applicationMenuShortcut
 
-    /// Displays the settings item for showing a shortcut in the Toolbar
+    /// Displays the settings item for showing a shortcut in the macOS toolbar.
     case toolbarShortcut
+
+    /// Displays the AI Chat icon in the iOS browsing menu toolbar.
+    case browsingToolbarShortcut
+
+    /// Displays the AI Chat icon in the iOS address bar while on a SERP.
+    case addressBarShortcut
 }
 
 public enum NetworkProtectionSubfeature: String, Equatable, PrivacySubfeature {