Revamp/gather args infer

[Rockdu]

This pr:

1. move all implicit args inference logics into arguments.py for clear references (getattr(args, "xxx", default_val), (args.xxx or None), etc), so that almost all arguments are determined after argument parsing phase.
2. update_weight_target_module was originally set in arguments.py, but actually related to specific models. This pr absorb update_weight_target_module into TrainPipelineConfig