added batch file upload logic

lib/screens/groups/models/create_group_from_file_response.dart

@@ -0,0 +1,48 @@
+import 'package:json_annotation/json_annotation.dart';
+import 'package:qpay/screens/groups/models/group_batch_model.dart';
+
+part 'create_group_from_file_response.g.dart';
+
+@JsonSerializable(explicitToJson: true)
+class FileUploadError {
+  final int lineNumber;
+  final String account;
+  final String name;
+  final String message;
+
+  const FileUploadError({
+    required this.lineNumber,
+    required this.account,
+    required this.name,
+    required this.message,
+  });
+
+  factory FileUploadError.fromJson(Map<String, dynamic> json) =>
+      _$FileUploadErrorFromJson(json);
+
+  Map<String, dynamic> toJson() => _$FileUploadErrorToJson(this);
+}
+
+@JsonSerializable(explicitToJson: true)
+class CreateGroupFromFileResponse {
+  final GroupBatch? batch;
+  final int totalRows;
+  final int successCount;
+  final int errorCount;
+  final List<FileUploadError> errors;
+
+  const CreateGroupFromFileResponse({
+    this.batch,
+    required this.totalRows,
+    required this.successCount,
+    required this.errorCount,
+    required this.errors,
+  });
+
+  factory CreateGroupFromFileResponse.fromJson(Map<String, dynamic> json) =>
+      _$CreateGroupFromFileResponseFromJson(json);
+
+  Map<String, dynamic> toJson() => _$CreateGroupFromFileResponseToJson(this);
+
+  bool get isSuccess => errors.isEmpty;
+}