Add constitution.lame_converter_orthotropic()

[adtzlr]

This PR adds a converter for the Lame parameters for orthotropic materials.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.32%. Comparing base (e741f0d) to head (7ba5532).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #904   +/-   ##
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  Coverage   97.32%   97.32%           
=======================================
  Files         179      179           
  Lines        6282     6291    +9     
=======================================
+ Hits         6114     6123    +9     
  Misses        168      168           

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[adtzlr]