feat: track checkpoint progress in micro-batches - #195
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没啥问题了，还剩 stacked PR 的冲突解决
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主要修改
该 PR 统一了 checkpoint 中训练进度的计量语义，将原先含义模糊的 consumed_batches 重命名为 consumed_train_samples。
在不同流水线并行配置下，DataLoader 单次迭代包含的 micro-batch 数量不同。该 PR 将 checkpoint 中保存的进度统一为 micro-batch 数量，并在恢复训练时根据当前 PP 配置换算为对应的 DataLoader 位置，同时正确处理 DDP rank 和步长。