Boxmot

Enable per class tracking in HybridSORT

HybridSORT available

- added `--vid-stride` arg
- added `--save-txt` args
- Minimize BOTSORT bbox operations
- Adapt per class tracking to new output shape (X, 7) --> (X, 8)

- Fix catastrophic OCSORT `det_ind` bug (https://github.com/mikel-brostrom/yolo_tracking/issues/1080)
- Minimize ByteTrack bbox operations
- Adapt BOTSORT to IoU matching changes

- Output detection index for each track in order to be able to match a pose estimation / segmentation mask to a specific track.

- Previously the output was:

- `(x, y, x, y, id, conf, cls)`

- now it is:

- `(x, y, x, y, id, conf, cls, ind)`

- Adapted existing tests to new tracking output
- StrongSORT fix so that it does not output predictions for non-existing detection indices inputs

- Fix load custom yolox model
- Fix load custom yolonas model