Remove dbi

[Edoardo-Pedicillo]

Closes #1523

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 99.67%. Comparing base (4588671) to head (b6461bd).
Report is 52 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1542      +/-   ##
==========================================
- Coverage   99.68%   99.67%   -0.02%     
==========================================
  Files          80       76       -4     
  Lines       11607    11229     -378     
==========================================
- Hits        11571    11193     -378     
  Misses         36       36              

Flag	Coverage Δ
unittests	99.67% <ø> (-0.02%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[andrea-pasquale]

Thanks @Edoardo-Pedicillo

[MatteoRobbiati]

Looks good to me!
I think the DBI has still to be removed from qibo/doc/source/code-examples/tutorials.

[MatteoRobbiati]

Thanks!