Add classical_renyi_relative_entropy and renyi_relative_entropy to quantum_info.entropies

[renatomello]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b4f8a37) 100.00% compared to head (5af2fe6) 100.00%.

❗ Current head 5af2fe6 differs from pull request most recent head 0c4b75a. Consider uploading reports for the commit 0c4b75a to get more accurate results

Additional details and impacted files

@@                  Coverage Diff                   @@
##           entanglement_entropy     #1180   +/-   ##
======================================================
  Coverage                100.00%   100.00%           
======================================================
  Files                        70        70           
  Lines                      9982     10012   +30     
======================================================
+ Hits                       9982     10012   +30     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.