- remove 5 seconds to stream_buffer_start start event key,
- use explicit variables names,
- split schedule events into multiple functions
- stream_output_start ends at the end of the scheduled period (fix#1556).
* Add shared python format-check target
* Add .format-check to api lint target
* Format api code with makefile format target
* Add .format-check to tools lint target
* Add .format-check to analyzer lint target
* Format analyzer code with makefile format target
* Add .format-check to celery lint target
* Add .format-check to api_client lint target
* Format api_client code with makefile format target
* Add .format-check to playout lint target
* Run CI linting in parallel
* Disable isort in pre-commit