Add diagonally_dominant flag to random_stochastic_matrix

[renatomello]

Checklist:

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

[renatomello]

Tests are only failing here because of qiboteam/qibocal#280 @scarrazza

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (7945be7) 100.00% compared to head (708782d) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #836   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines         5942      5950    +8     
=========================================
+ Hits          5942      5950    +8     

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

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

Impacted Files	Coverage Δ
src/qibo/quantum_info/random_ensembles.py	100.00% <100.00%> (ø)

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[andrea-pasquale]

Tests are only failing here because of qiboteam/qibocal#280 @scarrazza

Tests should pass now. We solved the issue in qiboteam/workflows#46.

[renatomello]

Tests are only failing here because of qiboteam/qibocal#280 @scarrazza

Tests should pass now. We solved the issue in qiboteam/workflows#46.

They are. Thank you.