Adding detuning to time_of_flight experiment

[andrea-pasquale]

Closes #1220 by adding a parameter detuning which indicates how much the frequency is detuned from the LO frequency.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.89%. Comparing base (14a53ce) to head (2433377).
⚠️ Report is 33 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1221      +/-   ##
==========================================
- Coverage   97.91%   97.89%   -0.02%     
==========================================
  Files         131      132       +1     
  Lines       10034    10044      +10     
==========================================
+ Hits         9825     9833       +8     
- Misses        209      211       +2     

Flag	Coverage Δ
unittests	97.89% <100.00%> (-0.02%)	⬇️

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Files with missing lines	Coverage Δ
...gnal_experiments/calibrate_state_discrimination.py	100.00% <100.00%> (ø)
...ocols/signal_experiments/time_of_flight_readout.py	100.00% <100.00%> (ø)
src/qibocal/protocols/signal_experiments/utils.py	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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[alecandido]

Minor comment about the docstring. But otherwise it looks good to me :)