Add geo3k tool

[xieck13]

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• Issue Number: Fixes issue # or discussion # if any.
• Training: [Note which backend this PR will affect: FSDP, Megatron, both, or none]
• Inference: [Note which backend this PR will affect: vLLM, SGLang, both, or none]

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[SwordFaith]

I will review once Congkai shares the correct WandB log. Currently, we are discussing the unusual behavior observed during training.