add util for loss spike save and decode.

[haikuotiankong1212]

What changes were proposed in this pull request?

针对loss尖刺的记录和解析提供了一个工具

Why are the changes needed?

为了更多训练的人来使用

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.25%. Comparing base (3157af7) to head (dd27cbf). Report is 244 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1044      +/-   ##
==========================================
- Coverage   78.53%   78.25%   -0.29%     
==========================================
  Files         187      191       +4     
  Lines       17336    17784     +448     
==========================================
+ Hits        13615    13916     +301     
- Misses       3721     3868     +147     

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[workingloong]

You need to format your commits to pass the test of atorch-pre-commit.

[BalaBalaYi]

Does this PR still need updates and merging? If so, please reply. This PR will be closed by the end of the month if there is no response. Thanks a lot.