[Feat] Add PointCloud ObjectDetection

[tchaton]

What does this PR do?

Fixes # (issue)

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[pep8speaks]

Hello @tchaton! Thanks for updating this PR.

• In the file flash/pointcloud/detection/model.py:

Line 123:117: W504 line break after binary operator

Comment last updated at 2021-07-16 17:06:58 UTC

[SeanNaren]

Don't know much about pointclouds, but LGTM :)

[ethanwharris]

LGTM 😃

[codecov]

Codecov Report

Merging #600 (b3813a4) into master (00fd908) will decrease coverage by 0.99%.
The diff coverage is 70.87%.

@@            Coverage Diff             @@
##           master     #600      +/-   ##
==========================================
- Coverage   90.90%   89.91%   -1.00%     
==========================================
  Files         132      140       +8     
  Lines        7795     8199     +404     
==========================================
+ Hits         7086     7372     +286     
- Misses        709      827     +118     

Flag	Coverage Δ
unittests	89.91% <70.87%> (-1.00%)	⬇️

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

Impacted Files	Coverage Δ
flash/pointcloud/segmentation/open3d_ml/app.py	30.61% <0.00%> (-1.39%)	⬇️
flash/pointcloud/detection/open3d_ml/app.py	27.36% <27.36%> (ø)
flash/pointcloud/detection/datasets.py	62.50% <62.50%> (ø)
flash/pointcloud/detection/model.py	82.81% <82.81%> (ø)
...ash/pointcloud/detection/open3d_ml/data_sources.py	82.90% <82.90%> (ø)
flash/pointcloud/detection/data.py	83.33% <83.33%> (ø)
flash/pointcloud/detection/open3d_ml/backbones.py	86.27% <86.27%> (ø)
flash/core/data/data_source.py	95.34% <100.00%> (+0.06%)	⬆️
flash/core/data/states.py	100.00% <100.00%> (ø)
flash/core/model.py	86.41% <100.00%> (+0.16%)	⬆️
... and 14 more

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