[LLM] Add deepseekv2

[DrownFish19]

PR types

New features

PR changes

Models

Description

Add deepseekv2.

[paddle-bot]

Thanks for your contribution!

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[codecov]

Codecov Report

Attention: Patch coverage is 14.89583% with 817 lines in your changes missing coverage. Please review.

Project coverage is 52.60%. Comparing base (2b975b1) to head (3b69adc).
Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/transformers/deepseek_v2/modeling.py	14.14%	765 Missing ⚠️
...addlenlp/transformers/deepseek_v2/configuration.py	13.04%	40 Missing ⚠️
...ddlenlp/transformers/deepseek_v2/tokenizer_fast.py	29.41%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9250      +/-   ##
===========================================
- Coverage    52.84%   52.60%   -0.24%     
===========================================
  Files          660      661       +1     
  Lines       107929   107493     -436     
===========================================
- Hits         57030    56547     -483     
- Misses       50899    50946      +47     

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