Add ReviewEvent model and ReviewSubmissionService for review management

- Created a new ReviewEvent model to track review events with fields for content, rating, moderation status, and timestamps.
- Added ForeignKey relationships to connect ReviewEvent with ContentSubmission, User, and Review.
- Implemented ReviewSubmissionService to handle review submissions, including creation, updates, and moderation workflows.
- Introduced atomic transactions to ensure data integrity during review submissions and updates.
- Added logging for review submission and moderation actions for better traceability.
- Implemented validation to prevent duplicate reviews and ensure only the review owner can update their review.

.gitignore

@@ -25,4 +25,58 @@ dist-ssr
 .snapshots/config.json
 .snapshots/sponsors.md
 .snapshots/
-context_portal
+context_portal
+
+# Django
+*.pyc
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Django database
+*.sqlite3
+*.db
+db.sqlite3
+
+# Django static files
+/django/staticfiles/
+/django/static/
+
+# Django media files
+/django/media/
+
+# Django migrations (keep the files, ignore bytecode)
+**/migrations/__pycache__/
+
+# Python virtual environment
+/django/venv/
+/django/env/
+/django/.venv/
+*.env
+!.env.example
+
+# Django local settings
+/django/config/settings/local_override.py
+
+# Celery
+celerybeat-schedule
+celerybeat.pid
+
+# Coverage reports
+htmlcov/
+.coverage
+.coverage.*
+.pytest_cache/
+.tox/
+
+# IDE
+*.swp
+*.swo
+*~
+.project
+.pydevproject
+.settings/
+
+# OS files
+.DS_Store
+Thumbs.db