Add new examples

[KEggensperger]

Update examples:

• Use diabetes dataset for regression example and plot predictions
• Create an example to use sklearn's inspect module

[codecov]

Codecov Report

Merging #1126 (f481cc4) into development (218aa84) will increase coverage by 0.77%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #1126      +/-   ##
===============================================
+ Coverage        85.51%   86.29%   +0.77%     
===============================================
  Files              137      137              
  Lines            10557    11630    +1073     
===============================================
+ Hits              9028    10036    +1008     
- Misses            1529     1594      +65     

Impacted Files	Coverage Δ
...ature_preprocessing/select_rates_classification.py	85.91% <0.00%> (-1.41%)	⬇️
...ine/components/classification/gradient_boosting.py	91.30% <0.00%> (-0.87%)	⬇️
autosklearn/util/pipeline.py	82.29% <0.00%> (-0.53%)	⬇️
autosklearn/estimators.py	93.24% <0.00%> (+0.16%)	⬆️
autosklearn/util/backend.py	76.51% <0.00%> (+0.35%)	⬆️
autosklearn/metrics/__init__.py	88.26% <0.00%> (+0.51%)	⬆️
autosklearn/ensemble_builder.py	77.28% <0.00%> (+0.62%)	⬆️
...n/pipeline/components/classification/libsvm_svc.py	89.28% <0.00%> (+1.19%)	⬆️
autosklearn/automl.py	87.14% <0.00%> (+2.38%)	⬆️
autosklearn/evaluation/abstract_evaluator.py	91.84% <0.00%> (+2.82%)	⬆️
... and 6 more

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[mfeurer]

Sorry, I forgot to hit the submit button this afternoon. Here's some more feedback on this PR.