move plot from old atomdensity class

[robinzyb]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 12.12121% with 29 lines in your changes missing coverage. Please review.

Project coverage is 26.04%. Comparing base (e6a5a51) to head (ba51610).

Files with missing lines	Patch %	Lines
ectoolkits/analysis/atom_density.py	12.12%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   26.18%   26.04%   -0.14%     
==========================================
  Files          23       23              
  Lines        3468     3501      +33     
==========================================
+ Hits          908      912       +4     
- Misses       2560     2589      +29     

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