feat: task file manage (#196)

1. support view task file list
2. support share file on android and iOS

ui/flutter/lib/app/routes/app_pages.dart

@@ -1,4 +1,5 @@
 import 'package:get/get.dart';
+import 'package:gopeed/app/modules/task/views/task_files_view.dart';
 import 'package:gopeed/app/modules/task/views/task_view.dart';
 
 import '../modules/create/bindings/create_binding.dart';
@@ -10,6 +11,7 @@ import '../modules/root/views/root_view.dart';
 import '../modules/setting/bindings/setting_binding.dart';
 import '../modules/setting/views/setting_view.dart';
 import '../modules/task/bindings/task_binding.dart';
+import '../modules/task/bindings/task_files_binding.dart';
 
 part 'app_routes.dart';
 
@@ -37,7 +39,14 @@ class AppPages {
                     name: _Paths.TASK,
                     page: () => const TaskView(),
                     transition: Transition.noTransition,
-                    binding: TaskBinding()),
+                    binding: TaskBinding(),
+                    children: [
+                      GetPage(
+                          name: _Paths.TASK_FILES,
+                          page: () => const TaskFilesView(),
+                          transition: Transition.noTransition,
+                          binding: TaskFilesBinding()),
+                    ]),
                 GetPage(
                   name: _Paths.SETTING,
                   page: () => const SettingView(),

ui/flutter/lib/app/routes/app_routes.dart

@@ -7,6 +7,7 @@ abstract class Routes {
   static const HOME = _Paths.HOME;
   static const CREATE = _Paths.CREATE;
   static const TASK = _Paths.HOME + _Paths.TASK;
+  static const TASK_FILES = TASK + _Paths.TASK_FILES;
   static const SETTING = _Paths.HOME + _Paths.SETTING;
 }
 
@@ -16,5 +17,6 @@ abstract class _Paths {
   static const HOME = '/home';
   static const CREATE = '/create';
   static const TASK = '/task';
+  static const TASK_FILES = '/files';
   static const SETTING = '/setting';
 }