AI-powered marking

[xxdydx]

Description

Created a new feature to automate feedback generation of code submissions in Source Academy, with the help of LLMs. This will help save TAs some time in grading code submissions from students!

• Added AI comment generation functionality in the backend.
• Integrated OpenAI API for generating AI comments.
• Implemented generate_ai_comments endpoint to fetch question details and generate AI-generated comments for submissions.
• Added save_chosen_comments endpoint to save multiple chosen comments for a submission and question for logging purposes.
• Added save_final_comment endpoint to save the final comment chosen for a submission for logging purposes.
• Added new ai_comment_logs table to log various data points from inputs, original student's code, outputs generated by LLM, comments chosen, and final comment.
• Added AIComments module to handle creation, retrieval, and updates for AI comments, including saving final and chosen comments.
• Added AICodeAnalysisController to handle AI comment generation, saving final comments, and saving chosen comments.
• Added test cases for generate_ai_comments, save_final_comment, and save_chosen_comments endpoints in AICodeAnalysisControllerTest.
• Updated Swagger documentation for the new endpoints.
• Added necessary migrations to update the database schema.
• Added encryption and decryption logic for LLM API keys using AES-GCM.

Note: This may require changes to the DB diagram in README.md.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

Checklist

• I have tested this code
• I have updated the documentation

[coveralls]

coverage: 88.729% (-0.9%) from 89.636%
when pulling c0c434a on feat/add-AI-generated-comments-grading
into 40cd12a on master.

[GabrielCWT]

Thanks for this feature! Quite a bit of comments. Please look through, resolve them. I do have some clarification comments as well so please answer those as well.

One question I have is when are these comments used? I couldn't find anytime in which the comments are returned/retrieved to/by the FE.

[RichDom2185]

Some questions about the schema

[RichDom2185]

@sentry generate-test

[seer-by-sentry]

Sentry has determined that unit tests are not necessary for this PR.