Add init_frz_model api for multi model

[iProzd]

Add --unit-model for dp freeze in multitask mode; Add init_frz_model api for multi model

[codecov-commenter]

Codecov Report

Base: 74.93% // Head: 75.65% // Increases project coverage by +0.71% 🎉

Coverage data is based on head (74a17d2) compared to base (e76973e).
Patch coverage: 78.51% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2206      +/-   ##
==========================================
+ Coverage   74.93%   75.65%   +0.71%     
==========================================
  Files         203      204       +1     
  Lines       20122    20231     +109     
  Branches     1438     1438              
==========================================
+ Hits        15079    15305     +226     
+ Misses       4137     4019     -118     
- Partials      906      907       +1     

Impacted Files	Coverage Δ
deepmd/infer/__init__.py	80.76% <0.00%> (ø)
deepmd/train/trainer.py	83.91% <0.00%> (+13.56%)	⬆️
deepmd/utils/argcheck.py	90.34% <0.00%> (+0.68%)	⬆️
deepmd/utils/data_system.py	82.37% <0.00%> (ø)
deepmd/entrypoints/train.py	87.21% <66.66%> (+7.58%)	⬆️
deepmd/entrypoints/freeze.py	60.73% <70.58%> (+14.79%)	⬆️
deepmd/utils/multi_init.py	85.33% <85.33%> (ø)
deepmd/model/multi.py	84.30% <93.33%> (+8.98%)	⬆️
deepmd/entrypoints/main.py	91.26% <100.00%> (+0.06%)	⬆️
deepmd/train/run_options.py	88.49% <100.00%> (+0.10%)	⬆️
... and 7 more

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