refactor: Improve logging process

[aaaandychen]

this pr is related to issue: #314 , which is to extend metrics with 0 mean and unify post process of different backends.

1. Added metric_process for metric reduction: Implemented backend data collection and formatted it into tensors for input. This method calculates mean values for specified parameters and provides extended metric support.
2. Refactored log_process: Standardized the workflow to unify the metric reduction logic for both FSDP and Megatron.
   Testing confirms that FSDP maintains stable parameter magnitudes consistent with the baseline, while extending support for max, min, and std values for designated parameters.

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