feat(*): add sender to files pack result

lib/src/model/model.dart

@@ -3,5 +3,6 @@ export 'nearby_device_status.dart';
 export 'nearby_message.dart';
 export 'nearby_message_content.dart';
 export 'communication_channel_state.dart';
-export 'nearby_file.dart';
+export 'nearby_file_info.dart';
 export 'nearby_message_content_type.dart';
+export 'nearby_files_pack.dart';

lib/src/model/nearby_file_info.dart

@@ -1,4 +1,3 @@
-import 'dart:io';
 import 'package:nearby_service/nearby_service.dart';
 
 ///
@@ -8,46 +7,7 @@ import 'package:nearby_service/nearby_service.dart';
 /// From the communication channel, you usually get
 /// the [NearbyMessageFilesRequest] request first.
 /// After that, you can send positive [NearbyMessageFilesResponse] and
-/// get the list of [NearbyFile].
-///
-final class NearbyFile {
-  ///
-  /// Pass [info] assigned to file to be sent.
-  ///
-  const NearbyFile({
-    required this.info,
-    required this.file,
-  });
-
-  ///
-  /// Quick info about the file
-  ///
-  final NearbyFileInfo info;
-
-  ///
-  /// A file that you can save in your phone if needed
-  ///
-  final File file;
-
-  @override
-  bool operator ==(Object other) =>
-      identical(this, other) ||
-      other is NearbyFile &&
-          runtimeType == other.runtimeType &&
-          info == other.info &&
-          file == other.file;
-
-  @override
-  int get hashCode => info.hashCode ^ file.hashCode;
-
-  @override
-  String toString() {
-    return 'NearbyFile{info: $info, file: $file}';
-  }
-}
-
-///
-/// Quick info about the file
+/// get the list of [NearbyFileInfo].
 ///
 class NearbyFileInfo {
   ///

lib/src/model/nearby_files_pack.dart

@@ -0,0 +1,54 @@
+import 'package:nearby_service/nearby_service.dart';
+
+///
+/// Used to provide result [files] that was got from [sender].
+///
+/// Can be received from [NearbyServiceFilesListener] only.
+///
+class ReceivedNearbyFilesPack implements NearbyReceivedInterface {
+  const ReceivedNearbyFilesPack({
+    required this.sender,
+    required this.files,
+  });
+
+  factory ReceivedNearbyFilesPack.fromJson(Map<String, dynamic>? json) {
+    return ReceivedNearbyFilesPack(
+      sender: NearbyDeviceInfo.fromJson(json?['sender']),
+      files: [
+        ...?(json?['files'] as List?)?.map(
+          (e) => NearbyFileInfo.fromJson(e as Map<String, dynamic>),
+        ),
+      ],
+    );
+  }
+
+  @override
+  final NearbyDeviceInfo sender;
+
+  final List<NearbyFileInfo> files;
+
+  Map<String, dynamic> toJson() {
+    return {
+      'sender': sender.toJson(),
+      'files': [
+        ...files.map((e) => e.toJson()),
+      ],
+    };
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      other is ReceivedNearbyFilesPack &&
+          runtimeType == other.runtimeType &&
+          sender == other.sender &&
+          files == other.files;
+
+  @override
+  int get hashCode => sender.hashCode ^ files.hashCode;
+
+  @override
+  String toString() {
+    return 'NearbyFilesPack{sender: $sender, files: $files}';
+  }
+}