Pystream-pipeline

- [ ] Add parallelization using multiprocessing.

- [ ] Support for pipeline branching and merging.

- [ ] Code formatting CI.
- [ ] Deny stage name with any non alphanumeric or "_" characters.
- [ ] Measure `time.wait()` error during wait test.

- [x] Support for native mixed (serial and parallel) operation.
- [x] Specify custom profiler DB path
- [x] Protect against multiple profiling in mixed pipeline
- [x] CI test for notebooks
- [x] CI test using python 3.11

- [x] Add built-in pipeline profiling feature.
- [x] `forward` method of `pystream.Pipeline` have default value: the flag to use input generator
- [x] Well-explained sample usage of the demo in `.ipynb` format.
- [x] Unit tests for staged pipeline operations.
- [x] Unit tests for functional pipeline operations.
- [x] Use logger instead of print
- [x] Specify stage name

- [x] Option to use blocking pipeline input for parallel pipeline.
- [x] An application example: [KITTI mapping](https://github.com/MukhlasAdib/KITTI_Mapping).