[suggestion] Export format add YOLOV8-OBB

[TRYOKETHEPEN]

Thanks for this project!

After v8.1, Ultralytics added adaptation to YOLOv8-OBB, and the dataset format is:
class_index, x1, y1, x2, y2, x3, y3, x4, y4

At now, label-studio's export option "YOLO" only support the tradditional YOLO-detection:
class_index, x_center, y_center, width, height
And the only way to make OBB dataset is: transform from exported JSON to OBB format, using a Python script.

Could you please add an export option to support YOLOV8-OBB natively?