1. Fix random seed for trainer and init it at the first line of init
2. Add a regress test for fixed training
3. Change the dataset 'dureader_robust_qg' to 'DuReader_robust-QG'
4. Change some datasets from loading hf.datasets to loading msdataset.load
Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10029509
1. Support saving the best checkpoint for inference
2. Fix a bug that _max_iters field does not exist in trainer
3. Fix a bug that function in lambda_lr field cannot be saved to file
4. Fix a bug that save_pretrained would not be called by iterating
5. Fix a bug that interval is not passed from BestCkptHook's init
Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9972765
