feat(ios): migrate to Swift Package Manager and upgrade linphone-sdk

example/lib/main.dart

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'dart:async';
 
-import 'package:flutter/services.dart';
 import 'package:liblinphone_flutter/liblinphone_flutter.dart';
 
 void main() {
@@ -16,7 +15,6 @@ class MyApp extends StatefulWidget {
 }
 
 class _MyAppState extends State<MyApp> {
-  String _platformVersion = 'Unknown';
   final _liblinphoneFlutterPlugin = LiblinphoneFlutter();
 
   @override
@@ -25,21 +23,10 @@ class _MyAppState extends State<MyApp> {
     initPlatformState();
   }
 
-  // Platform messages are asynchronous, so we initialize in an async method.
   Future<void> initPlatformState() async {
-    String platformVersion;
-    // Platform messages may fail, so we use a try/catch PlatformException.
-    // We also handle the message potentially returning null.
-    platformVersion = 'stub';
-
-    // If the widget was removed from the tree while the asynchronous platform
-    // message was in flight, we want to discard the reply rather than calling
-    // setState to update our non-existent appearance.
     if (!mounted) return;
 
-    setState(() {
-      _platformVersion = platformVersion;
-    });
+    setState(() {});
   }
 
   @override
@@ -47,7 +34,28 @@ class _MyAppState extends State<MyApp> {
     return MaterialApp(
       home: Scaffold(
         appBar: AppBar(title: const Text('Plugin example app')),
-        body: Center(child: Text('Running on: $_platformVersion\n')),
+        body: Column(
+          children: [
+            StreamBuilder(
+              stream: _liblinphoneFlutterPlugin.registrationEvents,
+              builder: (context, snapshot) {
+                return ListTile(
+                  leading: snapshot.hasData
+                      ? const Icon(Icons.check)
+                      : (snapshot.hasError
+                            ? const Icon(Icons.error)
+                            : const CircularProgressIndicator()),
+                  title: Text(
+                    snapshot.hasData
+                        ? "${snapshot.data}"
+                        : (snapshot.hasError ? "${snapshot.error}" : "Loading"),
+                  ),
+                  subtitle: const Text("Registration events"),
+                );
+              },
+            ),
+          ],
+        ),
       ),
     );
   }