Hyperoptimizing with Optuna

[MatteoRobbiati]

Moving from Hyperopt to Optuna, which is more maintained.

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 99.81%. Comparing base (e7061b0) to head (36a76c9).

❗ Current head 36a76c9 differs from pull request most recent head 38f93c8

Please upload reports for the commit 38f93c8 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1338      +/-   ##
==========================================
- Coverage   99.84%   99.81%   -0.03%     
==========================================
  Files          74       72       -2     
  Lines       10735    10490     -245     
==========================================
- Hits        10718    10471     -247     
- Misses         17       19       +2     

Flag	Coverage Δ
unittests	99.81% <100.00%> (-0.03%)	⬇️

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[andrea-pasquale]

Thanks @MatteoRobbiati, given that #1269 was just merged probably we need to update this PR.
Eventually me or @Sam-XiaoyueLi could take care of merging main. Let me know.