sorting imports on save; cleanup imports sorting; add isort check (#207)

nerfactory/graphs/modules/ray_generator.py

@@ -17,8 +17,9 @@ Ray generator.
 """
 from torch import nn
 from torchtyping import TensorType
-from nerfactory.cameras.rays import RayBundle
+
 from nerfactory.cameras.cameras import get_camera_model
+from nerfactory.cameras.rays import RayBundle
 
 
 class RayGenerator(nn.Module):

nerfactory/graphs/modules/scene_colliders.py

@@ -18,8 +18,9 @@ Ray generator.
 import torch
 from torch import nn
 from torchtyping import TensorType
-from nerfactory.data.structs import SceneBounds
+
 from nerfactory.cameras.rays import RayBundle
+from nerfactory.data.structs import SceneBounds
 
 
 class SceneBoundsCollider(nn.Module):