Add quantum_fisher_information_matrix to quantum_info.metrics

[renatomello]

Checklist:

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

[alecandido]

I'm essentially fine with it, just a few minor comments.

[alecandido]

Ah, the tests are not passing (because of the linter), that should be fixed (of course - but the CI is already there to remind you...).

[alecandido]

Btw, @MatteoRobbiati, pay attention to this PR, since it will affect the TensorFlow/Pytorch backend migration to Qiboml.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.93%. Comparing base (e7276d8) to head (7fe3d1f).
Report is 18 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1487   +/-   ##
=======================================
  Coverage   99.93%   99.93%           
=======================================
  Files          81       81           
  Lines       11795    11834   +39     
=======================================
+ Hits        11787    11826   +39     
  Misses          8        8           

Flag	Coverage Δ
unittests	99.93% <100.00%> (+<0.01%)	⬆️

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