[ArtistP0] add PretrainedConfig and unit test

[ZwhElliott]

PR types

PR changes

Description

[sijunhe]

之前MegatronBert的PR已经合入了，这个PR不应该包含MegatronBert，应该merge develop就可以了

[codecov]

Codecov Report

Merging #4989 (db4c771) into develop (8d0801e) will increase coverage by 1.33%.
The diff coverage is 98.63%.

@@             Coverage Diff             @@
##           develop    #4989      +/-   ##
===========================================
+ Coverage    46.32%   47.66%   +1.33%     
===========================================
  Files          448      454       +6     
  Lines        64616    65383     +767     
===========================================
+ Hits         29936    31165    +1229     
+ Misses       34680    34218     -462     

Impacted Files	Coverage Δ
paddlenlp/transformers/megatronbert/tokenizer.py	100.00% <ø> (+9.09%)	⬆️
paddlenlp/transformers/megatronbert/modeling.py	94.94% <98.14%> (+70.37%)	⬆️
paddlenlp/transformers/__init__.py	100.00% <100.00%> (ø)
paddlenlp/transformers/artist/configuration.py	100.00% <100.00%> (ø)
paddlenlp/transformers/artist/modeling.py	80.55% <100.00%> (+15.69%)	⬆️
...ddlenlp/transformers/megatronbert/configuration.py	100.00% <100.00%> (ø)
paddlenlp/trainer/integrations.py	68.22% <0.00%> (-18.37%)	⬇️
paddlenlp/taskflow/pos_tagging.py	13.88% <0.00%> (-14.38%)	⬇️
paddlenlp/taskflow/poetry_generation.py	83.33% <0.00%> (-10.00%)	⬇️
paddlenlp/taskflow/question_answering.py	83.33% <0.00%> (-9.53%)	⬇️
... and 39 more

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