[dataset] (DJI ROCO) add train/val/test files so everyone has the same splits

...co/robomaster_Central China Regional Competition/test.txt

...o/robomaster_Central China Regional Competition/train.txt

...obomaster_Central China Regional Competition/trainval.txt

...oco/robomaster_Central China Regional Competition/val.txt

dataset/dji_roco/robomaster_Final Tournament/test.txt

dataset/dji_roco/robomaster_Final Tournament/train.txt

dataset/dji_roco/robomaster_Final Tournament/trainval.txt

dataset/dji_roco/robomaster_Final Tournament/val.txt

...roco/robomaster_North China Regional Competition/test.txt

...oco/robomaster_North China Regional Competition/train.txt

.../robomaster_North China Regional Competition/trainval.txt

..._roco/robomaster_North China Regional Competition/val.txt

...roco/robomaster_South China Regional Competition/test.txt

...oco/robomaster_South China Regional Competition/train.txt

.../robomaster_South China Regional Competition/trainval.txt

..._roco/robomaster_South China Regional Competition/val.txt