Adding fockdamping operation

[kaspernielsen96]

Context:
Adding fockdamping operation
Description of the Change:
Adding the bargmann representation of the fockdamping operation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.70%. Comparing base (25a97a8) to head (e509979).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #409      +/-   ##
===========================================
+ Coverage    88.67%   88.70%   +0.03%     
===========================================
  Files           98       99       +1     
  Lines         6940     6959      +19     
===========================================
+ Hits          6154     6173      +19     
  Misses         786      786              

Files	Coverage Δ
mrmustard/lab_dev/transformations/__init__.py	100.00% <100.00%> (ø)
mrmustard/lab_dev/transformations/fockdamping.py	100.00% <100.00%> (ø)
mrmustard/physics/triples.py	100.00% <100.00%> (ø)

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[ziofil]

Nice! Although I think for efficiency it's better to define it as a ket-only operator, and then MM will take care of it in case the bra part is needed.

[kaspernielsen96]

I updated the channel to be a non trace preserving Operation, which now acts on kets

[ziofil]

Approved, though you'll now need to split it out in its own file after Anthony's reassessment of the files and directories. Also, Bargmann needs to be initialized using .from _function