Refactor backend and stream processing structure

- Updated Dockerfile in backend to set PYTHONPATH and modify CMD for Django server.
- Changed permissions for multiple Python files in backend to make them executable.
- Adjusted import paths in influxdb_service.py and views.py to reflect new structure.
- Removed unused utils and loggingFactory files from stream_processing.
- Added new utils for logging and flux query building.
- Enhanced error handling and logging in mQTTClientHandler.py.
- Updated docker-compose.yaml to include utils directory for both backend and stream processing services.
- Improved JSON handling in jsonhandler.py with better exception management.