Turned bargmann property into a method and added batched argument

[ziofil]

This PR turns the .bargmann property into a method and adds the argument batched, which now can be set to False and avoid having to extract the A,b,c triple from a batch of length 1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.96%. Comparing base (b1b662f) to head (1c58ec7).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #445   +/-   ##
========================================
  Coverage    88.96%   88.96%           
========================================
  Files          101      101           
  Lines         7049     7051    +2     
========================================
+ Hits          6271     6273    +2     
  Misses         778      778           

Files	Coverage Δ
mrmustard/lab_dev/circuit_components.py	97.73% <100.00%> (+0.01%)	⬆️
mrmustard/lab_dev/states/base.py	96.19% <100.00%> (ø)
mrmustard/lab_dev/transformations/base.py	97.19% <100.00%> (ø)

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