Sap-cf-logging

Added
- Support set and get correlation ID

Added
- Support for Falcon web framework

Changed
- Hide sensitive fields by default

Fixed
- Do not apply JSON formatting on unknown LogRecord

Fixed
- Fix missing sap namespace in response readers

Changed
- Introduced sap namespace

Changed
- Improved documentation

Changed
- Improved JSON logging
- Simplified integration with Flask applications
- Simplified integration with Sanic applications
- Cleanup for open-sourcing