Remove unused dependencies

[g123k]

Quoted from @monsieurtanuki in #1882

Regarding app size in general as in OP, maybe we could get rid of external packages that we don't use often. For the record, those are all the external packages we use:

% grep -rh ".dart';" * | grep -v "package:smooth_app" | grep -v "package:flutter" | grep -v "package:openfoodfacts" | sort | uniq -c | sort
   1 import 'package:camera_web/camera_web.dart';
   1 import 'package:carousel_slider/carousel_slider.dart';
   1 import 'package:collection/collection.dart';
   1 import 'package:device_preview/device_preview.dart';
   1 import 'package:fwfh_selectable_text/fwfh_selectable_text.dart';
   1 import 'package:hive/hive.dart';
   1 import 'package:http/http.dart';
   1 import 'package:image_cropper/image_cropper.dart';
   1 import 'package:image_cropper_for_web/image_cropper_for_web.dart';
   1 import 'package:image_picker/image_picker.dart';
   1 import 'package:image_picker_for_web/image_picker_for_web.dart';
   1 import 'package:intl/intl.dart';
   1 import 'package:iso_countries/iso_countries.dart';
   1 import 'package:latlong2/latlong.dart';
   1 import 'package:matomo_forever/matomo_forever.dart';
   1 import 'package:modal_bottom_sheet/modal_bottom_sheet.dart';
   1 import 'package:package_info_plus_web/package_info_plus_web.dart';
   1 import 'package:path/path.dart';
   1 import 'package:path_provider/path_provider.dart';
   1 import 'package:percent_indicator/percent_indicator.dart';
   1 import 'package:photo_view/photo_view.dart';
   1 import 'package:photo_view/photo_view_gallery.dart';
   1 import 'package:qr_code_scanner/qr_code_scanner.dart';
   1 import 'package:rxdart/rxdart.dart';
   1 import 'package:sentry_flutter/sentry_flutter_web.dart';
   1 import 'package:shared_preferences/shared_preferences.dart';
   1 import 'package:shared_preferences_web/shared_preferences_web.dart';
   1 import 'package:typed_data/typed_buffers.dart';
   1 import 'package:url_launcher_web/url_launcher_web.dart';
   1 import 'package:uuid/uuid.dart';
   2 import 'package:mailto/mailto.dart';
   2 import 'package:permission_handler/permission_handler.dart';
   2 import 'package:sentry_flutter/sentry_flutter.dart';
   2 import 'package:visibility_detector/visibility_detector.dart';
   4 import 'package:google_ml_barcode_scanner/google_ml_barcode_scanner.dart';
   4 import 'package:package_info_plus/package_info_plus.dart';
   4 import 'package:url_launcher/url_launcher.dart';
   6 import 'package:camera/camera.dart';
   6 import 'package:hive_flutter/hive_flutter.dart';
   8 import 'package:auto_size_text/auto_size_text.dart';
  44 import 'package:provider/provider.dart';

Originally posted by @monsieurtanuki in https://github.com/openfoodfacts/smooth-app/issues/1882#issuecomment-1129950841

[M123-dev]

We should check how much space the packages need not just plain code but after building

[M123-dev]

https://docs.flutter.dev/perf/app-size