new update in dev branch:Fix waymo converter to save img in .jpg(offical in waymo open) reduce dataset from 3.3T to 1.1T

[zzj403]

Motivation

This PR follows the PR in #1690
Just change branch to dev

Modification

I modifed the save_image function in class Waymo2KITTI
in tools/data_converter/waymo_converter.py

To make the generated ***.pkl to remember the image's file_tail is .jpg. I modified the get_image_path function in tools/data_converter/kitti_data_utils.py, add a file_tail(default='.png') param for it to make the .jpg file_tail be able to be passed in. Besides, this willnot disturb the usage for KITTI processing.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[zzj403]

hi need review here~ anyone saw me? _

[JingweiZhang12]

@zzj403 Thanks for your PR. We have already tried this feature in dev-1.x branch. Indeed, it reduces the storage size of the dataset greatly.

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