add zxhe-sean to CODEOWNERS

[zxhe-sean]

Description

Add zxhe-sean to owners of src/maxtext/kernels/megablox, src/maxtext/layers/moe.py, src/maxtext/layers/multi_token_prediction.py and src/maxtext/layers/quantizations.py

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Tests

N/A

Checklist

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• I have performed a self-review of my code. For an optional AI review, add the gemini-review label.
• I have necessary comments in my code, particularly in hard-to-understand areas.
• I have run end-to-end tests tests and provided workload links above if applicable.
• I have made or will make corresponding changes to the doc if needed, including adding new documentation pages to the relevant Table of Contents (toctree directive) as explained in our documentation.

[gemini-code-assist]

Code Review

This pull request updates the .github/CODEOWNERS file to add @zxhe-sean as a code owner for several components, including megablox kernels, mixture of experts (MoE) layers, multi-token prediction layers, and quantization layers. There are no review comments, and I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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