Add total_variation_distance to quantum_info.utils

[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 ✅

Project coverage is 99.94%. Comparing base (19f0c7f) to head (e9f5427).
Report is 15 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1452   +/-   ##
=======================================
  Coverage   99.94%   99.94%           
=======================================
  Files          81       81           
  Lines       11718    11733   +15     
=======================================
+ Hits        11711    11726   +15     
  Misses          7        7           

Flag	Coverage Δ
unittests	99.94% <100.00%> (+<0.01%)	⬆️

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.