Make LERF compatible with DINOv2

[chungmin99]

Added capability to use DINOv2 models

(Using implementation/torchhub as described by https://github.com/facebookresearch/dinov2)

TODOs:

• Compare/contrast DINO vs. DINOv2 features
• Add DINO feature visualization(?) -- for the compare/contrast. Initial implementation cause the colors to be inconsistent across renders, so it feels confusing/disorienting.
• Add compatibility for ViT-B/L/G DINO versions (currently dino-field embedding out hardcoded to 384)

[linukc]

i suggest to move KMeans and torch.pca_low_rank to the get_outputs_for_camera_ray_bundle function (aggregate all get_outputs from one image there and after perform dim reduction) to prevent different color palitre on a one image

[anas-zafar]

@chungmin99 , were you able to fully integrate Dinov2 with LERF?