add mask to atomic model output when an atomic type exclusion presents.

[wanghan-iapcm]

This PR also

• introduce atomic_output_def used wraps the fitting_output_def.
• atomic_output_def will be used by make_model
• add missing ut for pair and atom exclusions in dpmodel

See also #3357

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 76.60%. Comparing base (f4abe12) to head (4d21d0d).
Report is 6 commits behind head on devel.

Files	Patch %	Lines
...pmd/dpmodel/atomic_model/make_base_atomic_model.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #3389      +/-   ##
==========================================
+ Coverage   76.57%   76.60%   +0.02%     
==========================================
  Files         420      420              
  Lines       35682    35749      +67     
  Branches     1620     1620              
==========================================
+ Hits        27323    27384      +61     
- Misses       7491     7497       +6     
  Partials      868      868              

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