Add seed parameter to quantum_info.entangling_capacity

[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 (0eeb6ae) 100.00% compared to head (48bf93a) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1146   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           67        67           
  Lines         9588      9591    +3     
=========================================
+ Hits          9588      9591    +3     

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

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[AlejandroSopena]

Thanks @renatomello.