Adds a draft 3DGS impl we've been working on inside Google.#29

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brianwa84 wants to merge 2 commits intomainfrom

Commits on Oct 26, 2023

Adds a draft 3DGS impl we've been working on inside Google. Still some bugs to be hammered out, AFAIK, but gets us the basic tiling.
brianwa84
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Commits on Oct 27, 2023

Add jax nightly install, which makes things run properly.
brianwa84
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