implement assessment pass description, closes 202

[dmfs]

With this change an Assessment always provides a description, also in the pass case. This is useful for Qualitys like not, which can give a better description now. Before not could only return the actual value and the expectation of the delegate Quality. Now it can return a description of the actual assessment, which often contains more useful information.

To support development of pass descriptions, the passes Quality now has a variant that takes a single value and the expected description.

Also, all Qualitys have been updated to return proper pass descriptions, although some need further improvements in future updates.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.50%. Comparing base (95ba3e1) to head (69edbc7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #211      +/-   ##
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+ Coverage     96.33%   96.50%   +0.16%     
- Complexity      922      953      +31     
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  Files           240      246       +6     
  Lines          2157     2231      +74     
  Branches         66       72       +6     
============================================
+ Hits           2078     2153      +75     
- Misses           68       69       +1     
+ Partials         11        9       -2     

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