New single residue contribution iterator and indexing

[lmiq]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 97.43590% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.49%. Comparing base (79887a2) to head (a1b3fe1).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/tools/residue_contributions.jl	97.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   89.32%   89.49%   +0.17%     
==========================================
  Files          25       25              
  Lines        1648     1676      +28     
==========================================
+ Hits         1472     1500      +28     
  Misses        176      176              

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