Description

Create a conversion script from maxtext gemma-2 including gemma-2 2b/9b/27b to huggingface format.

Tests

I have converted the maxtext version of gemma-2-9b-it and gemma-2-27b-it into huggingface format and examined converted parameter weights and it matches with official huggingface gemma-2 weight.

Checklist

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• [X] I have performed a self-review of my code.
• [X] I have necessary comments in my code, particularly in hard-to-understand areas.
• [X] I have run end-to-end tests tests and provided workload links above if applicable.
• [X] I have made or will make corresponding changes to the doc if needed.

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I have added conversion script for gemma-3 and examined converted parameter weights and it matches with official huggingface gemma-3 weight.