Sauron states

[ziofil]

Context:
This PR adds Sauron states, i.e. approximations of Number states by a superposition of coherent states on a ring.

Description of the Change:

Benefits:
It's like having Fock states but CV.

Possible Drawbacks:
Be careful that the batch dimension can grow considerably when taking products with other objects (the batch dimension distributes)

Related GitHub Issues:

[codecov]

Codecov Report

Attention: Patch coverage is 94.59459% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 87.63%. Comparing base (3d8c81c) to head (449ef2d).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #400   +/-   ##
========================================
  Coverage    87.63%   87.63%           
========================================
  Files           81       81           
  Lines         6129     6163   +34     
========================================
+ Hits          5371     5401   +30     
- 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/lab_dev/states/states.py	100.00% <100.00%> (ø)
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% <85.71%> (-1.81%)	⬇️

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