Feature: Pagination, Search, Filtering and Sorting (Notes and Quizzes)

[TUT888]

Summary

This PR introduces pagination, search, filtering, and sorting capabilities for the notes and quizzes features.

Detail changes

Pagination

• Added a new PageResponse<T> class that standardizes paginated responses by containing both the page metadata (current page, total pages, page size, total elements) and the page content.
• Updated repositories to return Page<T> instead of List<T> to prevent loading large datasets into memory.
• Refactored service-layer getAll methods to use Spring Data’s Pageable instead of retrieving all records. The service now:
  • Builds a Pageable object (with pagination + sorting).
  • Retrieves a Page<T> from the repository.
  • Maps the page content into DTOs and wraps the result in PageResponse<T>.
• Updated controllers to accept optional page and size parameters. If omitted, default values from common/DefaultConstants.java are applied

Search and Filtering

• Updated repositories to extend JpaSpecificationExecutor<T> to support dynamic filtering via JPA Specifications.
• Added filter DTOs for mapping query parameters using @ModelAttribute:
  • BasicFilterDTO: supports keyword search and date-range filtering.
  • QuizFilterDTO: extends BasicFilterDTO and adds quizSetId for filtering quizzes belonging to a specific quiz set.
• Implemented predicate builders and specification builders:
  • CommonPredicateBuilder: provides reusable predicate helpers to reduce duplication across specifications.
  • NoteSpecificationBuilder, QuizSpecificationBuilder, and QuizSetSpecificationBuilder: construct entity-specific filtering logic used by repositories.

Sorting

• Updated controllers to accept sortBy and sortOrder parameters. Defaults to sorting by updatedAt in descending order.
• Updated services to incorporate sorting into the Pageable configuration before querying the repository.

Testing

• Added new tests covering pagination behavior for NoteService, NoteController and DocumentRepository.

Remaining & Upcomming Works

• Current tests only cover pagination. Additional tests are needed for search, filtering, and sorting.
• This PR only implements the new functionality for notes and quizzes. Other features (e.g., flashcards) will require similar updates

[pvdev1805]

Verified the changes, all features tested and working as expected.