Enable GreyBoxBlocks with cyipopt-watertap

[bknueven]

Fixes/Resolves: N/A

Summary/Motivation:

We have an emerging need to use GreyBox models with WaterTAP. This PR would modify our cyipopt wrapper so that GreyBoxBlocks work correctly. This necessitates making a few other changes to the solver wrapper, including bring into WaterTAP the IDAES jacobian scaling so that we can utilize a custom-built PyomoNLP object when we have a model with GreyBoxBlocks.

Changes proposed in this PR:

• Add _get_pyomo_nlp abstract method and implementations for both classes
• Bring in the Jacobian constraint autoscaling capability from IDAES to run on custom-built PyomoNLP objects
• Add tests to make sure we deal with the dummy objective correctly
• Add test for Pyomo model with GreyBoxBlocks and cyipopt-watertap.

Legal Acknowledgement

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[avdudchenko]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 96.92308% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.94%. Comparing base (df6264c) to head (beb5a18).
Report is 36 commits behind head on main.

Files with missing lines	Patch %	Lines
watertap/core/plugins/solvers.py	96.92%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1434       +/-   ##
===========================================
+ Coverage   41.22%   93.94%   +52.71%     
===========================================
  Files          97      310      +213     
  Lines       10599    33206    +22607     
===========================================
+ Hits         4369    31194    +26825     
+ Misses       6230     2012     -4218     

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