Feature: Tutorial 5 mesh handle version

[lenaploetzke]

Describe your changes here:
Closes #2237 . This replaces #2236 where something got messed up ...

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.50%. Comparing base (e34672a) to head (e0ae53b).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2246   +/-   ##
=======================================
  Coverage   78.50%   78.50%           
=======================================
  Files         115      115           
  Lines       19198    19198           
=======================================
  Hits        15071    15071           
  Misses       4127     4127           

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[spenke91]

Thanks a lot! Really cool to see the mesh handle "in action" :-)

I just have a bunch of minor suggestions 👍
(Regarding the doxygen comments, I know our CI workflow does not require it for the tutorials, but I think we should still make sure to document everything properly here, because the tutorials are usually the first piece of code people see when starting / considering to use 8code.

[spenke91]

Looks very good, thanks!