[Feature] Add load_interval for nuScenes dataset

[selmadeac]

What is the feature?

Add load_interval for nuScenes dataset as in waymo:

train_dataloader = dict(dataset=dict(dataset=dict(load_interval=5)))

Any other context?

Hi! I would like to train on a part of the nuScenes dataset, not all of it. Could you please provide a method to do so? In Waymo, one can set: train_dataloader = dict(dataset=dict(dataset=dict(load_interval=5))) . In nuScenes it does not work.