expose eigsh paramters

[m-reuter]

See #112

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.01%. Comparing base (431dd33) to head (245f2f5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #113      +/-   ##
==========================================
+ Coverage   49.96%   50.01%   +0.04%     
==========================================
  Files          15       15              
  Lines        3144     3147       +3     
  Branches      412      413       +1     
==========================================
+ Hits         1571     1574       +3     
  Misses       1425     1425              
  Partials      148      148              

Flag	Coverage Δ
unittests	50.01% <100.00%> (+0.04%)	⬆️

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