Add SiSWAPDG gate

[renatomello]

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (330f1bb) 100.00% compared to head (9c197dd) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1191   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           69        69           
  Lines        10170     10186   +16     
=========================================
+ Hits         10170     10186   +16     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[MatteoRobbiati]

Thanks! I would add the SiSWAPDG gate to the documentation (doc.source...).
I would also take the opportunity to fix the rendering of LaTeX in the SiSWAP (one more brace than necessary).

[renatomello]

Thanks! I would add the SiSWAPDG gate to the documentation (doc.source...). I would also take the opportunity to fix the rendering of LaTeX in the SiSWAP (one more brace than necessary).

Thanks for the docstring tip. I didn't add the gate to the API ref because no other "dagger" gate is there.

[MatteoRobbiati]

Thanks for the docstring tip. I didn't add the gate to the API ref because no other "dagger" gate is there.

I see, thanks.