[Feature] Support LaserMix augmentation

[Xiangxu-0103]

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Motivation

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Modification

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BC-breaking (Optional)

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Checklist

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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.

[codecov]

Codecov Report

Base: 46.37% // Head: 47.06% // Increases project coverage by +0.69% 🎉

Coverage data is based on head (6eec6b9) compared to base (d84e081).
Patch coverage: 67.77% of modified lines in pull request are covered.

❗ Current head 6eec6b9 differs from pull request most recent head a3e2273. Consider uploading reports for the commit a3e2273 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #2302      +/-   ##
===========================================
+ Coverage    46.37%   47.06%   +0.69%     
===========================================
  Files          259      262       +3     
  Lines        21390    22026     +636     
  Branches      3379     3466      +87     
===========================================
+ Hits          9919    10366     +447     
- Misses       10827    10995     +168     
- Partials       644      665      +21     

Flag	Coverage Δ
unittests	47.06% <67.77%> (+0.69%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet3d/datasets/transforms/__init__.py	100.00% <ø> (ø)
mmdet3d/evaluation/__init__.py	100.00% <ø> (ø)
mmdet3d/models/dense_heads/fcaf3d_head.py	16.23% <ø> (ø)
mmdet3d/models/detectors/mink_single_stage.py	43.58% <ø> (ø)
mmdet3d/testing/data_utils.py	70.83% <ø> (ø)
mmdet3d/models/voxel_encoders/voxel_encoder.py	38.46% <6.94%> (-12.08%)	⬇️
...t3d/models/data_preprocessors/data_preprocessor.py	39.10% <17.24%> (-5.05%)	⬇️
mmdet3d/datasets/transforms/formating.py	58.03% <33.33%> (+1.78%)	⬆️
mmdet3d/models/data_preprocessors/voxelize.py	33.92% <33.92%> (ø)
mmdet3d/datasets/transforms/loading.py	48.13% <60.60%> (+0.79%)	⬆️
... and 27 more

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[ZwwWayne]

Hi @Xiangxu-0103 ,
Thanks for your kind PR. It seems that there are conflicts between your PR and the targeted branch. Could you solve the conflicts so that we could eventually merge this PR?

You can find more details in the place shown as below:

[Xiangxu-0103]

Hi @Xiangxu-0103 , Thanks for your kind PR. It seems that there are conflicts between your PR and the targeted branch. Could you solve the conflicts so that we could eventually merge this PR?

You can find more details in the place shown as below:

resolved.