[Optimization] Support context_parallel_spliter for cp

[zhangyuqin1998]

Before submitting

PR types

Function optimization

PR changes

Others

Description

Support for context_parallel_spliter in context_parallel (cp). Users are able to set a custom splitter to divide the input when using cp.

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 51.41%. Comparing base (08183d7) to head (b1fb8b8).
Report is 8 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/trainer/trainer.py	40.00%	3 Missing ⚠️

❌ Your patch check has failed because the patch coverage (40.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (51.41%) is below the target coverage (58.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9904   +/-   ##
========================================
  Coverage    51.40%   51.41%           
========================================
  Files          745      745           
  Lines       118373   118377    +4     
========================================
+ Hits         60853    60861    +8     
+ Misses       57520    57516    -4     

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