Added a first vtk output for tensor-wedges

[Davknapp]

I develop a vtk-output for TensorProductWedges. This type of vtk-output is not based on Lagrange-elements, because the nodes of the TensorProductWedge can be distributed very different from the the nodes of a VTK_LAGRANGE_WEDGE. The nodes of the triangulare basis define a subdivision of the wedge, so does the line. Given these subdivisions, wedges are defined and written into the vtk-file.

[codecov[bot]]

Codecov Report

Merging #127 (ff7ea5d) into main (95d8ce1) will increase coverage by 0.01%. The diff coverage is 98.14%.

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   97.29%   97.31%   +0.01%     
==========================================
  Files          25       25              
  Lines        2848     2902      +54     
==========================================
+ Hits         2771     2824      +53     
- Misses         77       78       +1     

Impacted Files	Coverage Δ
src/mesh/vtk_helper.jl	99.37% <ø> (ø)
src/mesh/mesh_visualization.jl	94.49% <98.14%> (+3.58%)	:arrow_up:

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[Davknapp]

LGTM! Any other changes you want to make before we merge?

Thanks! No, nothing to add currently.

[jlchan]

Thanks again for adding this! I'll release a new version