Real interferometer

[ziofil]

Context:
It would be nice to have a trainable real interferometer (i.e. one that doesn't mix q and p)

Description of the Change:
I added a new gate: RealInterferometer

Benefits:
We have it now :)

Possible Drawbacks:
None

Related GitHub Issues:
None

[codecov]

Codecov Report

Merging #132 (4f081a9) into main (8902144) will increase coverage by 1.70%.
The diff coverage is 89.18%.

@@            Coverage Diff             @@
##             main     #132      +/-   ##
==========================================
+ Coverage   68.70%   70.41%   +1.70%     
==========================================
  Files          26       26              
  Lines        2732     2687      -45     
==========================================
+ Hits         1877     1892      +15     
+ Misses        855      795      -60     

Impacted Files	Coverage Δ
mrmustard/utils/training.py	81.96% <ø> (-1.11%)	⬇️
mrmustard/lab/gates.py	91.77% <85.71%> (-0.43%)	⬇️
mrmustard/math/math_interface.py	96.64% <93.33%> (+18.48%)	⬆️
mrmustard/lab/states.py	98.00% <100.00%> (-0.02%)	⬇️

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[sduquemesa]

Hi @ziofil, this is looking good from my side! ✨ I left some small suggestions and questions on the implementation.

On the testing side, I found a pattern related to making tests deterministic that was common in SF and perhaps we could try to avoid bringing into Mr Mustard. 🔍