Add TaskInfo class with serialization and documentation

Added a new TaskInfo class to encapsulate information related to a specific benchmark task.

- The TaskInfo class holds attributes like the data file path, regression status, task categories, task details, expected answer, and description.
- Included methods for JSON serialization and deserialization.
- Added comprehensive documentation to describe the purpose, properties, and methods of the TaskInfo class.

frontend/lib/models/benchmark/task_info.dart

@@ -0,0 +1,68 @@
+/// TaskInfo holds information related to a specific benchmark task.
+///
+/// The class encapsulates various attributes of a task, such as the path to the data file,
+/// whether the task is a regression task, the categories it falls under, and specific task details
+/// like the task description, expected answer, and so on.
+class TaskInfo {
+  /// The path to the data file associated with the task.
+  /// This is typically a JSON file containing the dataset or resources needed for the task.
+  final String dataPath;
+
+  /// A boolean indicating whether the task is a regression task.
+  final bool isRegression;
+
+  /// A list of categories to which the task belongs.
+  final List<String> category;
+
+  /// The specific task that needs to be performed.
+  final String task;
+
+  /// The expected answer for the task.
+  final String answer;
+
+  /// A description providing details about the task.
+  final String description;
+
+  /// Constructs a new TaskInfo instance.
+  ///
+  /// [dataPath]: The path to the data file for the task.
+  /// [isRegression]: A boolean indicating if the task is a regression task.
+  /// [category]: A list of categories to which the task belongs.
+  /// [task]: The specific task to be performed.
+  /// [answer]: The expected answer for the task.
+  /// [description]: A description of the task.
+  TaskInfo({
+    required this.dataPath,
+    required this.isRegression,
+    required this.category,
+    required this.task,
+    required this.answer,
+    required this.description,
+  });
+
+  /// Creates a TaskInfo instance from a map.
+  ///
+  /// [json]: A map containing key-value pairs corresponding to TaskInfo fields.
+  ///
+  /// Returns a new TaskInfo populated with values from the map.
+  factory TaskInfo.fromJson(Map<String, dynamic> json) => TaskInfo(
+        dataPath: json['data_path'],
+        isRegression: json['is_regression'],
+        category: List<String>.from(json['category']),
+        task: json['task'],
+        answer: json['answer'],
+        description: json['description'],
+      );
+
+  /// Converts the TaskInfo instance to a map.
+  ///
+  /// Returns a map containing key-value pairs corresponding to TaskInfo fields.
+  Map<String, dynamic> toJson() => {
+        'data_path': dataPath,
+        'is_regression': isRegression,
+        'category': category,
+        'task': task,
+        'answer': answer,
+        'description': description,
+      };
+}