Refactor readout mitigation matrix routine

[Edoardo-Pedicillo]

• Remove pulse option
• use proper data attribute
• simplify post-processing
• fix bug (matrix flipping)
• (small fixes in mermin)
• propagate in CHSH

http://login.qrccluster.com:9000/ots5pm92QcWJRS5-lJx4Fg==/

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.
• Compatibility with Qibo modules (Please edit this section if the current pull request is not compatible with the following branches).
  • Qibo: master
  • Qibolab: 0.1
  • Qibolab_platforms_qrc: 0.1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.31%. Comparing base (c8b54f2) to head (d7f30da).
Report is 10 commits behind head on mermin_refactor.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           mermin_refactor    #1045      +/-   ##
===================================================
- Coverage            97.34%   97.31%   -0.03%     
===================================================
  Files                  124      124              
  Lines                 9914     9888      -26     
===================================================
- Hits                  9651     9623      -28     
- Misses                 263      265       +2     

Flag	Coverage Δ
unittests	97.31% <100.00%> (-0.03%)	⬇️

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

Files with missing lines	Coverage Δ
src/qibocal/protocols/readout_mitigation_matrix.py	97.50% <100.00%> (-2.50%)	⬇️
...l/protocols/two_qubit_interaction/chsh/circuits.py	100.00% <100.00%> (ø)
...l/protocols/two_qubit_interaction/chsh/protocol.py	97.66% <100.00%> (ø)
...protocols/two_qubit_interaction/mermin/protocol.py	100.00% <100.00%> (ø)

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