Implement link previews for text messages using Apple's LinkPreview framework (#4520)

ElementX/Sources/Screens/Settings/DeveloperOptionsScreen/DeveloperOptionsScreenModels.swift

@@ -54,6 +54,7 @@ protocol DeveloperOptionsProtocol: AnyObject {
     var knockingEnabled: Bool { get set }
     
     var nextGenHTMLParserEnabled: Bool { get set }
+    var linkPreviewsEnabled: Bool { get set }
 }
 
 extension AppSettings: DeveloperOptionsProtocol { }

ElementX/Sources/Screens/Settings/DeveloperOptionsScreen/View/DeveloperOptionsScreen.swift

@@ -63,6 +63,15 @@ struct DeveloperOptionsScreen: View {
                     Text("Low priority filter")
                 }
             }
+            
+            Section("Timeline") {
+                Toggle(isOn: $context.linkPreviewsEnabled) {
+                    Text("Link previews")
+                    Text("Follows the timeline media visibility settings.")
+                    Text("Can leak the device IP address when loading link metadata.")
+                        .foregroundStyle(.compound.textCriticalPrimary)
+                }
+            }
                         
             Section("Join rules") {
                 Toggle(isOn: $context.knockingEnabled) {