TF-3042 Create PublicAsset and display after pick image

lib/features/public_asset/domain/extensions/string_to_public_asset_extension.dart

@@ -0,0 +1,15 @@
+import 'package:html/parser.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
+import 'package:tmail_ui_user/features/public_asset/presentation/public_asset_controller.dart';
+
+extension StringToPublicAssetExtension on String {
+  List<PublicAssetId> get publicAssetIdsFromHtmlContent {
+    final document = parse(this);
+    final images = document
+      .querySelectorAll('img[public-asset-id]')
+      .where((element) => element.attributes['public-asset-id'] != null);
+    return images
+      .map((element) => Id(element.attributes['public-asset-id']!))
+      .toList();
+  }
+}