Officially support Voigt and Mandel forms

[KeitaNakamura]

No description provided.

[codecov-io]

Codecov Report

Merging #39 (c327d85) into main (eeb0a69) will increase coverage by 3.92%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
+ Coverage   90.30%   94.22%   +3.92%     
==========================================
  Files          12       12              
  Lines         732      797      +65     
==========================================
+ Hits          661      751      +90     
+ Misses         71       46      -25     

Impacted Files	Coverage Δ
src/Tensorial.jl	100.00% <ø> (ø)
src/voigt.jl	100.00% <100.00%> (+45.45%)	⬆️

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