Add support for late-time 3D models based on Fornax#375

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sybenzvi wants to merge 3 commits intomainfrom

SB-fornax-2024-update

Commits on Feb 23, 2025

Add Fornax_2024 reader class.
Segev BenZvi
committed
Add class to support Fornax 2024 3D models.
Segev BenZvi
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Temporarily point to branch of snewpy-models-ccsn.
Segev BenZvi
committed