Front lidar only available for 1/5th of scenes

Nobody has claimed this yet.

Front lidar data is missing for 4/5th of the scenes. There are 148 scenes out of the 180 without front lidars.

The specs at https://level5.lyft.com/dataset/ say that there are 3 lidars: 'One 40-beam roof LiDAR and two 40-beam bumper LiDARs.'

There is no mention of scenes with only partial lidar data.

You can check these scenes with the following code snippet:
```python
for scene in level5data.scene:
sample_token = scene['first_sample_token']
sample = level5data.get('sample', sample_token)
if 'LIDAR_FRONT_LEFT' not in sample['data'].keys():
print(scene['name'])
```

Run the provided Python snippet against the Lyft Level 5 dataset and inspect the scene metadata returned by the devkit. Compare the 148 missing front-lidar scenes with the dataset specifications at level5.lyft.com; done means documenting or correcting the explanation of front-lidar availability.

Written by the indexing model from the issue text.