Minor adjustments in result objects

[andrea-pasquale]

Required by qiboteam/qibocal#832
This PR "corrects" the average property of AveragedIntegratedResults by returning the object itself without performing the average again.
I've also added the property phase_std which is useful for qibocal (if you think that it is not necessary I can always drop it and do it directly in qibocal).
I'm keeping it as draft to account for any possible changes in qiboteam/qibocal#832

EDIT: I've also implemented #897 here.
Checklist:

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

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 66.62%. Comparing base (41fcafd) to head (e1a7f84).
Report is 28 commits behind head on main.

Files	Patch %	Lines
src/qibolab/result.py	78.57%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #896      +/-   ##
==========================================
+ Coverage   66.61%   66.62%   +0.01%     
==========================================
  Files          55       55              
  Lines        5942     5954      +12     
==========================================
+ Hits         3958     3967       +9     
- Misses       1984     1987       +3     

Flag	Coverage Δ
unittests	66.62% <78.57%> (+0.01%)	⬆️

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[alecandido]

Fine for 0.1, I'd replace all results objects in 0.2 with arrays (possibly newtype or annotated for the sake of the type check, but just arrays at runtime).

I just left a few minor comments, but they are not changing anything drastically.

[alecandido]

Maybe an error?

(It's true that is already averaged, but asking for its average doesn't make sense)

[andrea-pasquale]

Just a temporary patch for qibocal.

[alecandido]

Even this one sounds more appropriate as an error...

[andrea-pasquale]

Same here

[hay-k]

I think for now this is fine as a hack to support qibocal needs. In long term I agree that these result classes should be revisited and simplified.

[alecandido]

In long term I agree that these result classes should be revisited and simplified.

Since it's only listed in the events, but not linked in any comment, let me note explicitly that it has already been scheduled for 0.2 #899

I could provide a PR with the *Results removal, and basic replacement in the common layer. However, replacing with just arrays means that most of the work will have to be done in the drivers (just returning arrays instead of *Result) and Qibocal (handling it properly).