Implement quiz feature with difficulty assessment and analytics

[turiddu25]

This pull request introduces significant enhancements to the OOSE-AI-Question-Generator project, focusing on the implementation of a quiz feature, question difficulty assessment, similarity checking, and analytics functionality.

• Quiz Feature Implementation: Adds a new quiz management system (quiz/quiz_manager.py) that allows users to select questions based on difficulty and integrates a method to assess question difficulty. It also includes functionality to present questions to the user and check their answers.
• Similarity Checker: Introduces a similarity checker (quiz/similarity_checker.py) that compares user responses to correct answers, providing feedback on the accuracy of the user's response.
• User Interface for Quiz: Implements a user interface (quiz/quiz_ui.py) for the quiz feature, enabling users to interact with the quiz through a graphical interface. This includes buttons for checking answers and moving to the next question, as well as displaying the current question and the user's score.
• Analytics Enhancements: Updates the analytics/analytics_tracker.py to include methods for assessing and storing question difficulty. Additionally, a new analytics module (analytics/quiz_analytics.py) is added to log quiz attempts and summarize user performance, including the difficulty of questions attempted and the number of correct answers.
• Documentation and Dependencies: Updates the README.md to reflect the new quiz feature, similarity checker, and analytics functionality. The requirements.txt is also updated to include necessary libraries for the similarity checker.

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