Add Config Class for Benchmark Configuration Management

This commit introduces a new `Config` class, designed to manage and store configuration settings related to the benchmark run. The class contains two key fields:

1. `agentBenchmarkConfigPath`: The path to the agent's benchmark configuration file.
2. `host`: The address of the host where the benchmark is running.

The class includes methods for serialization and deserialization, allowing easy conversion between `Config` objects and JSON maps.

Documentation comments have also been added for better code readability and understanding.

frontend/lib/models/benchmark/config.dart

@@ -0,0 +1,41 @@
+/// `Config` holds configuration settings related to the benchmark run.
+///
+/// It contains the path to the benchmark configuration for the agent and
+/// the host address where the benchmark is running.
+class Config {
+  /// The path to the configuration file for the agent's benchmark.
+  /// This is typically a JSON file specifying various settings and parameters
+  /// for the benchmark run.
+  final String agentBenchmarkConfigPath;
+
+  /// The host address where the benchmark is running.
+  /// This could be a local or remote server address.
+  final String host;
+
+  /// Constructs a new `Config` instance.
+  ///
+  /// [agentBenchmarkConfigPath]: The path to the agent's benchmark configuration file.
+  /// [host]: The host address where the benchmark is running.
+  Config({
+    required this.agentBenchmarkConfigPath,
+    required this.host,
+  });
+
+  /// Creates a `Config` instance from a map.
+  ///
+  /// [json]: A map containing key-value pairs corresponding to `Config` fields.
+  ///
+  /// Returns a new `Config` populated with values from the map.
+  factory Config.fromJson(Map<String, dynamic> json) => Config(
+        agentBenchmarkConfigPath: json['agent_benchmark_config_path'],
+        host: json['host'],
+      );
+
+  /// Converts the `Config` instance to a map.
+  ///
+  /// Returns a map containing key-value pairs corresponding to `Config` fields.
+  Map<String, dynamic> toJson() => {
+        'agent_benchmark_config_path': agentBenchmarkConfigPath,
+        'host': host,
+      };
+}