[feat] Wandb Timing: Add more detailed timing of gen_sequence and weights resharding

[ETOgaosion]

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Wandb Timing: Add more detailed timing of gen_sequence and weights resharding.

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• 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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[vermouth1992]

Shall we move this to verl/utils/debug/performance.py?

[ETOgaosion]

Yes, make sense to me, didn't find this in the same directory.

[vermouth1992]

LGTM