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 89.62%. Comparing base (dc86850) to head (1365431).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #334      +/-   ##
==========================================
+ Coverage   89.13%   89.62%   +0.49%     
==========================================
  Files          16       17       +1     
  Lines        1961     2160     +199     
==========================================
+ Hits         1748     1936     +188     
- Misses        213      224      +11     

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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?