dataset(ngt): add ngt dataset initial loading script
Currently only making the paths to the annotation ELAN (eaf) file and videos available.
This is the first accessible way to download this dataset, which is not manual file-by-file.

Only downloading the necessary files, the annotation files are very small, 20MB for all of them, but the video files are large, 100GB in total, saved in `mpg` format. 
I do not intend to actually store these as an uncompressed array of frames, because it will be huge.

Future updates may add pose estimation files for all videos, making it easier to work with this data