refactor: structure of the fetchers folder

[simaopsbarbosa]

Closes #1859

i organized the structure of the fetchers folder with a new domain / feature-based organization system. here is a brief before and after:

Before

lib/controller/fetchers/
      ├── course_units_fetcher/
      │   ├── all_course_units_fetcher.dart
      │   ├── course_units_info_fetcher.dart
      │   └── current_course_units_fetcher.dart
      ├── location_fetcher/
      │   ├── location_fetcher.dart
      │   ├── location_fetcher_asset.dart
      │   └── location_fetcher_osm.dart
      ├── schedule_fetcher/
      │   ├── schedule_fetcher.dart
      │   ├── schedule_fetcher_api.dart
      │   └── schedule_fetcher_new_api.dart
      ├── book_fetcher.dart
      ├── calendar_fetcher_json.dart
      ├── courses_fetcher.dart
      ├── departures_fetcher.dart
      ├── exam_fetcher.dart
      ├── faculties_fetcher.dart
      ├── fees_fetcher.dart
      ├── library_occupation_fetcher.dart
      ├── news_fetcher.dart
      ├── print_fetcher.dart
      ├── professor_info_fetcher.dart
      ├── profile_fetcher.dart
      ├── profile_info_fetcher.dart
      ├── reference_fetcher.dart
      ├── restaurant_fetcher.dart
      ├── session_dependant_fetcher.dart
      └── terms_and_conditions_fetcher.dart

After

lib/controller/fetchers/
      ├── core/ # base interfaces & application-level configurations
      │   ├── session_dependent_fetcher.dart # (spelling correction & renamed)
      │   └── terms_and_conditions_fetcher.dart
      │
      ├── academics/ # enrollments, schedules, grades, and faculty calendars
      │   ├── course_units/ # subdomain for course unit pages (moved)
      │   │   ├── all_course_units_fetcher.dart
      │   │   ├── course_units_info_fetcher.dart
      │   │   └── current_course_units_fetcher.dart
      │   ├── schedule/ # subdomain for timetable schedules (moved)
      │   │   ├── schedule_fetcher.dart
      │   │   ├── schedule_fetcher_api.dart
      │   │   └── schedule_fetcher_new_api.dart
      │   ├── calendar_fetcher.dart # (renamed from calendar_fetcher_json.dart)
      │   ├── courses_fetcher.dart
      │   ├── exam_fetcher.dart
      │   ├── faculties_fetcher.dart
      │   └── professor_info_fetcher.dart
      │
      ├── profile/ # student profile and personal details
      │   ├── profile_fetcher.dart
      │   └── profile_info_fetcher.dart
      │
      ├── finances/ # account balances, statement logs, fees, and ATM references
      │   ├── current_account_fetcher.dart # (renamed from fees_fetcher.dart)
      │   ├── print_fetcher.dart
      │   └── reference_fetcher.dart # (multibanco payment references)
      │
      ├── campus/ # campus resources, canteen menu, libraries, map pins, and news
      │   ├── locations/ # subdomain for maps and floor plans (moved)
      │   │   ├── location_fetcher.dart
      │   │   ├── location_fetcher_asset.dart
      │   │   └── location_fetcher_osm.dart
      │   ├── book_thumbnail_fetcher.dart # (renamed from book_fetcher.dart)
      │   ├── library_occupation_fetcher.dart
      │   ├── news_fetcher.dart # (university news feed)
      │   └── restaurant_fetcher.dart # (restaurant menus)

Other changes

• i renamed fees_fetcher.dart to current_account_fetcher.dart
• i renamed book_fetcher.dart to book_thumbnail_fetcher.dart
• i renamed calendar_fetcher_json.dart to calendar_fetcher.dart
• i renamed session_dependant_fetcher.dart to session_dependent_fetcher.dart (typo)
• fixed all imports
• removed bus related fetchers and entities

Review checklist

• Terms and conditions reflect the changes

View Changes

• Description has screenshots of the UI changes.
• Tested both in light and dark mode.
• New text is both in portuguese (PT) and english (EN).
• Works in different text zoom levels.
• Works in different screen sizes.

Performance

• No helper functions to return widgets are added. New widgets are created instead.
• Used ListView.builder for Long Lists.
• Controllers (TextEditingController, ...) are beeing disposed of in dispose() method.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 6%. Comparing base (34157d8) to head (df02ab2).
⚠️ Report is 1 commits behind head on develop.

❌ Your project check has failed because the head coverage (6%) is below the target coverage (70%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1861   +/-   ##
=======================================
+ Coverage        6%      6%   +1%     
=======================================
  Files           38      38           
  Lines         2148    2121   -27     
=======================================
  Hits           125     125           
+ Misses        2023    1996   -27     

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[goncalopinto1]

LGTM 🚀

[pedroafmonteiro]

Looks good! Just need to solve the conflicts and is ready to merge! 🚀