feat: Working VoIP calling implementation (Flutter + Android)

Working video and audio calls, as well as android integration

lib/widgets/local_view.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+class LocalView extends StatelessWidget {
+  const LocalView({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final Map<String, dynamic> creationParams = <String, dynamic>{};
+
+    return AndroidView(
+      viewType: "liblinphone_flutter.nuark.xyz/local_view",
+      creationParams: creationParams,
+      creationParamsCodec: const StandardMessageCodec(),
+      onPlatformViewCreated: (int id) {
+        print("onPlatformViewCreated: created LocalView with id $id");
+      },
+    );
+  }
+}