feat(nextcloud): Export content string

Signed-off-by: jld3103 <jld3103yt@gmail.com>

packages/nextcloud/bin/generate_exports.dart

@@ -56,6 +56,7 @@ ${idStatements.join('\n')}
 ''');
 
   File('lib/nextcloud.dart').writeAsStringSync('''
+export 'package:dynamite_runtime/content_string.dart';
 export 'package:dynamite_runtime/http_client.dart' show CookieJar, DynamiteApiException, DynamiteRawResponse, DynamiteResponse;
 
 ${exportStatements.sorted((final a, final b) => a.compareTo(b)).join('\n')}

packages/nextcloud/lib/nextcloud.dart

@@ -1,3 +1,4 @@
+export 'package:dynamite_runtime/content_string.dart';
 export 'package:dynamite_runtime/http_client.dart'
     show CookieJar, DynamiteApiException, DynamiteRawResponse, DynamiteResponse;