Add cqr examples

[LacombeLouis]

Description

Fixes issue #205 by creating a notebook that compares different components of CQR, its stability on some key parameters, and comparison to quantile regression. We only use one of the datasets of the original paper.

Type of change

Please remove options that are irrelevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist

• [x] I have read the contributing guidelines
• [x] I have updated the HISTORY.rst and AUTHORS.rst files
• [x] Linting passes successfully : make lint
• [x] Typing passes successfully : make type-check
• [x] Unit tests pass successfully : make tests
• [x] Coverage is 100% : make coverage
• [ ] Documentation builds successfully : make doc

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (cbcbab8) compared to base (69904ca). Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #206   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines         2290      2290           
  Branches       253       253           
=========================================
  Hits          2290      2290           

Impacted Files	Coverage Δ
mapie/conformity_scores.py	100.00% <ø> (ø)
mapie/metrics.py	100.00% <ø> (ø)
mapie/quantile_regression.py	100.00% <ø> (ø)
mapie/regression.py	100.00% <ø> (ø)

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