#100 Implemented Advanced Assessment and Testing Platform

[Richiey1]

This PR adds a comprehensive on-chain assessment system to the TeachLink contract.

Features:

• CRUD for assessments and questions.
• Automated grading for Multiple Choice, True/False, Short Answer, and Coding.
• Adaptive question selection based on performance.
• Plagiarism detection logic.
• Integration tests in 'tests/test_assessment.rs'.

Included fixes:

• Resolved storage key collisions in the assessment module.
• Fixed compilation errors in 'social_learning.rs' related to contract macros and iterators.
• Enabled several modules in 'lib.rs' for a complete contract build.

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[Richiey1]

Implemented the Advanced Assessment Platform with adaptive testing and comprehensive integration tests. Also resolved various build issues and storage key collisions to ensure a stable, passing codebase.