Replace pointers with tensor accessors in projection code

[swahtz]

📋 Originally created by @fwilliams

Original author: @fwilliams
Date: 2024-12-17T16:43:04Z

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• GaussianProjectionForward.cu (done all but a few?)
• GaussianProjectionBackward.cu
• GaussianProjectionJaggedForward.cu
• GaussianProjectionJaggedBackward.cu

[swahtz]

💬 Comment by @fwilliams

Original author: @fwilliams
Date: 2025-07-06T11:39:38Z

@harrism this appears do be done. Can we close this?

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📝 This comment was originally posted by @fwilliams and copied during issue migration

[swahtz]

💬 Comment by @harrism

Original author: @harrism
Date: 2025-07-22T00:04:36Z

This is absolutely not done. There are raw pointers all over this code.

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📝 This comment was originally posted by @harrism and copied during issue migration