qibo.ui import of matplotlib.pyplot

[BrunoLiegiBastonLiegi]

This should address #1536

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 99.68%. Comparing base (a518e99) to head (cd3fa6a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1537   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files          80       80           
  Lines       11585    11586    +1     
=======================================
+ Hits        11549    11550    +1     
  Misses         36       36           

Flag	Coverage Δ
unittests	99.68% <100.00%> (+<0.01%)	⬆️

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