MultiValues component names export

[Antoinemarteau]

Fixes #1036.

[codecov]

Codecov Report

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

Project coverage is 88.42%. Comparing base (309221b) to head (78e7db6).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
src/TensorValues/SymFourthOrderTensorValueTypes.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1038      +/-   ##
==========================================
+ Coverage   88.40%   88.42%   +0.01%     
==========================================
  Files         180      180              
  Lines       23239    23273      +34     
==========================================
+ Hits        20545    20578      +33     
- Misses       2694     2695       +1     

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[JordiManyer]

I've added a very minor comment.
Otherwise, everything looks great. Remember to pull from master and update NEWS.md with a small description of what you've done. After you are done I'll accept the PR.

[JordiManyer]

I would replace this by

component_names = _data_component_names(v)
vtk_cell_data(vtkfile, _prepare_data(v), k; component_names)

and idem everywhere else.

[Antoinemarteau]

Oh I didn't know this trick, I changed these.

[Antoinemarteau]

Actually the setindex overload is so cursed that I cannot avoid repeating the kwarg name in it :') .