Add lapack eigen functions

[cpmech]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.95649% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 99.25%. Comparing base (39608cb) to head (1030a3a).
Report is 403 commits behind head on main.

Files	Patch %	Lines
russell_lab/src/matrix/complex_mat_eigen.rs	96.53%	8 Missing ⚠️
russell_lab/src/matrix/complex_mat_gen_eigen.rs	97.88%	6 Missing ⚠️
russell_lab/src/matrix/mat_gen_eigen.rs	98.51%	6 Missing ⚠️
russell_lab/src/matrix/complex_mat_eigen_herm.rs	98.25%	4 Missing ⚠️
russell_lab/src/matrix/complex_mat_svd.rs	98.19%	4 Missing ⚠️
russell_lab/src/matrix/testing.rs	97.65%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   98.44%   99.25%   +0.81%     
==========================================
  Files         102      136      +34     
  Lines       20905    28357    +7452     
==========================================
+ Hits        20580    28147    +7567     
+ Misses        325      210     -115     

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