quadrature repr in CircuitComponent

[ziofil]

• Adds quadrature representation at the level of CircuitComponent: since it's a single-wire operation it always exists.

• Simplifies having to check for representation type when extracting data by creating a common abstraction scalar which means c for Bargmann and array for Fock, and data which is triple for Bargmann and array for Fock. This way we simplify lots of useless ifs and isinstance checks.

[codecov]

Codecov Report

Attention: Patch coverage is 94.52055% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 87.61%. Comparing base (90a259a) to head (3b9b0b0).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #399      +/-   ##
===========================================
- Coverage    87.63%   87.61%   -0.02%     
===========================================
  Files           81       81              
  Lines         6129     6154      +25     
===========================================
+ Hits          5371     5392      +21     
- Misses         758      762       +4     

Files	Coverage Δ
mrmustard/lab_dev/circuit_components.py	96.25% <100.00%> (+0.12%)	⬆️
mrmustard/lab_dev/states/base.py	96.46% <100.00%> (-0.09%)	⬇️
mrmustard/math/tensor_wrappers/xptensor.py	70.90% <ø> (ø)
mrmustard/physics/ansatze.py	95.08% <100.00%> (-0.06%)	⬇️
mrmustard/physics/converters.py	100.00% <100.00%> (ø)
mrmustard/physics/representations.py	97.67% <85.18%> (-1.81%)	⬇️

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[sylviemonet]

Except for the two TODOs rename thing, this PR looks nice to me! (happy to move the quadrature thing into CircuitComponent directly.

Please fix them and it is good to go!

[ziofil]

@elib20 can I get an approval when you have a minute?

[elib20]

Thanks for waiting! I have a few questions.

[elib20]

Thanks for addressing the comments! I'm approving, but left a couple remaining comments/questions to be addressed in future.