[Tokenizer] Compatible with the padding_side in _pad

[DrownFish19]

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PR types

Function optimization

PR changes

APIs

Description

Compatible with the padding_side in _pad

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 49.01%. Comparing base (9f5b697) to head (52204df).
Report is 192 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/transformers/tokenizer_utils_base.py	25.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #10423      +/-   ##
===========================================
- Coverage    49.01%   49.01%   -0.01%     
===========================================
  Files          765      765              
  Lines       125877   125884       +7     
===========================================
+ Hits         61699    61700       +1     
- Misses       64178    64184       +6     

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