Refactoring visualization

[dokempf]

This is quite a refactoring with these substeps:

• Unify the interface: DataSet.show entrypoint allows switching between different kinds of visualizations
• Visualization configuration is handled through schema
• UI widgets are available for visualization - through DataSet.show_interactive and in widget apps
• Integrate classification parameter into visualization widget
• Adapt filter tuning app to work again and use the same infrastructure

[codecov]

Codecov Report

Merging #80 (aeb8bdd) into main (9c8aecd) will decrease coverage by 1.76%.
The diff coverage is 67.69%.

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   85.68%   83.92%   -1.77%     
==========================================
  Files          14       14              
  Lines        1139     1163      +24     
==========================================
  Hits          976      976              
- Misses        163      187      +24     

Impacted Files	Coverage Δ
adaptivefiltering/pdal.py	93.75% <ø> (-1.71%)	⬇️
adaptivefiltering/apps.py	33.10% <9.52%> (-3.79%)	⬇️
adaptivefiltering/widgets.py	76.58% <71.42%> (-0.42%)	⬇️
adaptivefiltering/dataset.py	89.23% <84.61%> (-3.53%)	⬇️
adaptivefiltering/visualization.py	99.04% <100.00%> (+0.49%)	⬆️

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