Adds VectorNonlinearOracle support

[andrewrosemberg]

Adds VectorNonlinearOracle support by creating a bridge for the nonlinear backend

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.09%. Comparing base (0c84ac7) to head (cdd09a1).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
+ Coverage   90.20%   91.09%   +0.88%     
==========================================
  Files          16       17       +1     
  Lines        2164     2380     +216     
==========================================
+ Hits         1952     2168     +216     
  Misses        212      212              

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[andrewrosemberg]

There is only one issue. if I create a model with diff_optimizer it defaults to use conic backend even though it is not compatible with vno. Trying to figure out how to avoid this.

[joaquimg]

I'd like @blegat 's eyes on it.
For now, can we move the tests to seperate file only for VNO?