Add keywords argument for the subsolver of AL algorithm #327

[BenjaminPINEAU]

Add a feature sub_kwargs to pass a keywords argument for the subsolver of the Augmented Lagrangian algorithm.
This allows for instance to pass a callback in argument of the subsolver.

[MaxenceGollier]

Thank you @BenjaminPINEAU.

I think we provide an example in R2N/doc on how to use the NamedTuple type.
Can you update the doc here as well ?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.85%. Comparing base (e0f214d) to head (ad134c2).
⚠️ Report is 283 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #328       +/-   ##
===========================================
+ Coverage   61.53%   83.85%   +22.31%     
===========================================
  Files          11       12        +1     
  Lines        1292     1641      +349     
===========================================
+ Hits          795     1376      +581     
+ Misses        497      265      -232     

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[dpo]

Thank you.