New gaussian integral

[kaspernielsen96]

Context:
A gaussian integral that takes two Abc triplets.
Description of the Change:
Adding a new method for complex_gaussian_integral_2 that takes two abc triplets.

[codecov]

Codecov Report

Attention: Patch coverage is 94.28571% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.05%. Comparing base (e04652e) to head (f1be607).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #434      +/-   ##
===========================================
+ Coverage    88.03%   88.05%   +0.02%     
===========================================
  Files           80       80              
  Lines         6443     6473      +30     
===========================================
+ Hits          5672     5700      +28     
- Misses         771      773       +2     

Files	Coverage Δ
mrmustard/physics/gaussian_integrals.py	98.44% <94.28%> (-1.56%)	⬇️

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[ziofil]

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