APPSI Interface to WNTR

[michaelbynum]

Summary/Motivation:

This PR creates a persistent interface to the Newton solver in WNTR. It only supports square, equality-constrained problems.

Legal Acknowledgement

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1. I agree my contributions are submitted under the BSD license.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (ae85c0c) 87.98% compared to head (b474f2f) 88.01%.

Files	Patch %	Lines
pyomo/contrib/appsi/solvers/wntr.py	93.52%	22 Missing ⚠️
pyomo/contrib/appsi/base.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2902      +/-   ##
==========================================
+ Coverage   87.98%   88.01%   +0.03%     
==========================================
  Files         770      771       +1     
  Lines       90242    90583     +341     
==========================================
+ Hits        79400    79729     +329     
- Misses      10842    10854      +12     

Flag	Coverage Δ
linux	85.34% <93.27%> (+0.03%)	⬆️
osx	75.19% <93.27%> (+0.07%)	⬆️
other	85.52% <93.27%> (+0.03%)	⬆️
win	82.61% <93.27%> (+0.05%)	⬆️

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[michaelbynum]

Assuming tests pass, this should be ready to go now.