Add point cloud network support

[supersergiy]

Summary

• Add support for PointNet, PointNet++, and DGCNN architectures
• Wrap existing pointnet package for PointNet/PointNet++ models
• Implement DGCNN using torch_geometric's DynamicEdgeConv

Changes

• New zetta_utils/convnet/architecture/pointcloud.py module
• Add pointcloud optional dependency in pyproject.toml

[nkemnitz]

You'll have to include the pointcloud package to at least all for CI to pick it up (and update the requirements files).
... probably should even go into modules

[supersergiy]

@nkemnitz done

[codecov]

Codecov Report

❌ Patch coverage is 92.30769% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.96%. Comparing base (dac0b94) to head (2151ca2).

Files with missing lines	Patch %	Lines
zetta_utils/convnet/architecture/__init__.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1119      +/-   ##
==========================================
- Coverage   99.97%   99.96%   -0.02%     
==========================================
  Files         181      182       +1     
  Lines        8942     8955      +13     
==========================================
+ Hits         8940     8952      +12     
- Misses          2        3       +1     

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[nkemnitz]

Coverage is failing... that means pointcloud.py is not collected during the load_all_modules() test. If that's on purpose, you need to add that file to the omit list in .coveragerc.

[nkemnitz]

For reference, with PCG we print a warning: https://github.com/ZettaAI/internal/blob/07677dc1c40fb3aa882406a717417927cc248912/__init__.py#L11C1-L17C67

ModuleNotFoundError is also more precise than ImportError