[Trainer] add token metrics after regular & save step

[SylarTiaNII]

PR types

New features

PR changes

Others

Description

add token metrics after regular & save step

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.

Project coverage is 53.25%. Comparing base (a6cf882) to head (92804f2).

Files with missing lines	Patch %	Lines
paddlenlp/trainer/trainer.py	14.28%	6 Missing ⚠️
paddlenlp/trainer/trainer_utils.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9110      +/-   ##
===========================================
- Coverage    53.26%   53.25%   -0.01%     
===========================================
  Files          652      652              
  Lines       105588   105598      +10     
===========================================
+ Hits         56237    56239       +2     
- Misses       49351    49359       +8     

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