pt: support loading frozen models in DeepEval

[njzjz]

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (beb1b98) 75.27% compared to head (245401b) 75.28%.

❗ Current head 245401b differs from pull request most recent head 5ee5582. Consider uploading reports for the commit 5ee5582 to get more accurate results

Files	Patch %	Lines
deepmd/pt/entrypoints/main.py	0.00%	1 Missing ⚠️
deepmd/pt/infer/deep_eval.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #3253   +/-   ##
=======================================
  Coverage   75.27%   75.28%           
=======================================
  Files         373      373           
  Lines       33247    33243    -4     
  Branches     1605     1608    +3     
=======================================
  Hits        25026    25026           
+ Misses       7350     7344    -6     
- Partials      871      873    +2     

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[wanghan-iapcm]

I am not an expert of the part. I will follow Duo's suggestions.