* feat(train/training_internlm.py): move common init funcs to internlm/train
* feat(train/training_internlm.py): update some public funcs
* feat(train/training_internlm.py): update some public funcs
* feat(evaluation.py): adapt evaluate to streaming dataset
* feat(train/training_internlm.py): minor update based on comments
* fix(training_internlm.py): set train dataloader persistent_workers true only when num_worker>0
* fix(training_internlm.py): fix demo error
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