add viser viewer for training, with background image and point cloud viz #135
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Add config param "with_viser_gui"
example command:
python train.py --config-name apps/colmap_3dgut.yaml path=data/mipnerf360/bicycle out_dir=runs experiment_name=bicycle_3dgut dataset.downsample_factor=2 export_usdz.enabled=true with_viser_gui=true
Point cloud update while training:

Background image update while training:
