Transform from video_rgb format into video_det format and save in video_det/ directory.

[kdu4108]

Goal: given a video_rgb/ modality data folder of the following format:

root/video_rgb/shard-00000.tar
 |     ├── 00000.mp4 # this corresponds to one video.
 |     ├── 00001.mp4
 |     └── ...

produce a video_det/ modality folder of the following format:

root/video_det/shard-00000.tar
 |     ├── 00000.jsonl # this corresponds to one video. each line within it corresponds to one frame.
 |     ├── 00001.jsonl
 |     └── ...

For now, let's use YOLO pseudolabeler.
This should involve calling the YOLO pseudolabeler on the videos in video_rgb, generating outputs, and moving it into the right directory paths. Each jsonl corresponds to one video. Each line in the jsonl corresponds to one frame.

Example jsonl:

[
        # FRAME 0 Bounding boxes
        {
            "num_instances": 5,
            "image_height": 512,
            "image_width": 906,
            "instances": [
                {
                    "boxes": [
                        0.4229210317134857,
                        0.00020096010121051222,
                        0.5715101361274719,
                        0.13699540495872498
                    ],
                    "score": 0.9029952883720398,
                    "class_id": 74,
                    "class_name": "clock",
                    "segmentation": [
                        [
                            0.5055187637969095,
                            0.1337890625,
                            ...
                        ]
                    ]
                },
                {
                    "boxes": [
                        ...
                    ],
                    ...
                },
                    ...
            ]
        },
        # FRAME 1 Bounding boxes
        {
            "num_instances": 5,
            "image_height": 512,
            "image_width": 906,
            "instances": [
                ...,
            ],
            ...
        }
]

Child issue of #3.