chore: fix analysis problems

frontend/app_flowy/packages/appflowy_editor/lib/src/service/internal_key_event_handlers/legacy/arrow_keys_handler.dart

@@ -1,5 +1,4 @@
 import 'package:appflowy_editor/appflowy_editor.dart';
-import 'package:appflowy_editor/src/service/shortcut_event/shortcut_event_handler.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 

frontend/app_flowy/packages/appflowy_editor/lib/src/service/keyboard_service.dart

@@ -139,15 +139,3 @@ class _AppFlowyKeyboardState extends State<AppFlowyKeyboard>
     return onKey(event);
   }
 }
-
-extension on RawKeyEvent {
-  Keybinding get toKeybinding {
-    return Keybinding(
-      isAltPressed: isAltPressed,
-      isControlPressed: isControlPressed,
-      isMetaPressed: isMetaPressed,
-      isShiftPressed: isShiftPressed,
-      keyLabel: logicalKey.keyLabel,
-    );
-  }
-}

frontend/app_flowy/packages/appflowy_editor/lib/src/service/service.dart

@@ -1,4 +1,8 @@
-import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:appflowy_editor/src/service/input_service.dart';
+import 'package:appflowy_editor/src/service/keyboard_service.dart';
+import 'package:appflowy_editor/src/service/render_plugin_service.dart';
+import 'package:appflowy_editor/src/service/scroll_service.dart';
+import 'package:appflowy_editor/src/service/selection_service.dart';
 import 'package:appflowy_editor/src/service/toolbar_service.dart';
 import 'package:flutter/material.dart';