Develop HEOM superoperator for users

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[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (89defbf) 94.83% compared to head (d5c9e7a) 94.85%.

Files	Patch %	Lines
src/heom_matrices/heom_matrix_base.jl	92.20%	6 Missing ⚠️
src/Parity.jl	90.90%	1 Missing ⚠️
src/density_of_states.jl	98.14%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #44      +/-   ##
==========================================
+ Coverage   94.83%   94.85%   +0.01%     
==========================================
  Files          20       22       +2     
  Lines        1511     1535      +24     
==========================================
+ Hits         1433     1456      +23     
- Misses         78       79       +1     

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